Etymology
Although K.E. Hirn was the first to publish concerning ''Odeogoniales'', it is not clear as to whether he was the first to discover this new genus. First named ''Oedogoniaceen'' (German), Hirn used his knowledge of the Latin language to describe and name the green algal genus; ''oedos'' meaning swelling/tumor, and ''gonos'' meaning offspring/seed. This name was meant to describe theHistory of Knowledge
''Oedogonium'' species were first reported in the late 19th century by Hilse (1860), Hilse, W. 1860: Beitraege zur Algen – und Diatomeen-Kunde Schlesiens, insbesondere Strehlens. Jahresber. Schles. Ges vaterl. Cult. 38:75-86. Gołowin (1964), Gołowin, S. 1964: Glony torfowisk Chlebowo (pow. Oborniki, woj. poznańskie). Fragm. Florist. Geobot. Volume 10, 1:121-169. Kirchner (1878), Kirchner, O. 1878: Kryptogamenflora von Schlesien. Jahresber. Schles. Ges. Vaterl. Cult. 2,1:3-284. Kozłowski (1895) Kozłowski, W. 1895: Przyczynek do flory wodorostów okolic Warszawy. Pamiętn. Fizjogr. 13:63-73. and Gutwiński (1897). Gutwiński, R. 1897: Wykaz glonów zebranych z okolic Wadowic-Makowa. Spraw. Komis. Fizjogr. AU 32:97-217. Hilse was a Polish phycologist who studied freshwater systems in hopes of learning more about microorganisms and how they interacted with their environment. Along with ''Oedogonium'', Hilse is also credited with the discovery and classification of many diatoms. Mrozińska was the first to exam this group in terms of morphology, ecology and distribution and in his time described more than 400 species – mainly from southern Poland. In 1900, German scientist K.E. Hirn wrote a monograph concerning his finding of a newMorphology
Exterior
Cells of the genus ''Oedogonium'' are narrow and cylindrical in shape. The algal body consists of green, un-branched, and multi-cellular filaments, arranged end to end. Every cell of the filamentous algal body (called the thallus) is similar in shape apart from the apical cell (the uppermost) and the holdfast cell (the lowermost). The apical cell is wider and always rounded at its tip (having a cap) relative to the other cells of the thallus. The holdfast cell, however, produces elongated growths from both unattached sides which aid in firmly attaching the filament to substrate. Guiry, M.D., Guiry, G.M. 2008: AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 13 February 2019. The holdfast is also the only colourless cell of the filament. All other cells in the filament exist as green structures very similar in nature, with only some cells having caps. The number of caps per cell illustrates the number of times that cell has divided. Every cell of the filament has a cell wall consisting of three layers – the innermost is made of cellulose, the middle of pectose, and the outermost is made of chitin. These three layers provide rigidity and protection for these benthic species. Most cells are attached to the substrate by the holdfast and are vegetative cells, although some are free-floating.Species of ''Oedogonium'' are divided into two major groups based on distribution of the sex organs: macrandous and nannandrous species. Macrandous species have a male sex organ (the antheridia) and female sex organ (the oogonia) produced on filaments of normal size. This group is further subdivided into macrandous monoecious and macrandous dioecious. In macrandous monoecious species, the antheridia and oogonia are always found on the same filament. In contrary, in macrandous dioecious species, the antheridia and oogonia are produced on different filaments. Although filaments bearing antheridia and oogonia are morphologically similar, they differ physiologically. In nannandrous species, filaments producing antheridia and oogonia show morphological distinction. The antheridia, which are much smaller than the oogonia, are called dwarf male. Nannandrous species are always dioecious; i.e. antheridia and oogonia are always produced on different filaments. Small male filaments are likely to be attached to a female filament, near an oogonium.Interior
The protoplasm of ''Oedogonium'' is contained by a plasma membrane, and consists of a single nucleus, reticulate chloroplasts, cytoplasm and a central vacuole. Cell sap (contained by the central vacuole) is made up of inorganic compounds, excretions and secretions. Between the innermost cell wall and the central vacuole is a thin layer known as the protoplast. The single nucleus is large and oval shaped and sits in the centre of the cell – usually along the membrane and internal to the chloroplast. This large nucleus contains 1-2 nucleoli and elongated chromosomes. The reticulate, parietal chloroplast extends over the whole interior of the cell, enveloping the protoplast. Whether these networked strands are narrow or broad varies between species, but with most species these reticula are parallel to the long axis of the cell. At the strand junctions are pyrenoids, covered in starch plates. Cells of ''Oedogonium'' also contain very typical Golgi bodies, mitochondria, and endoplasmic reticulum.Habitat and Ecology
''Oedogonium'' resides in freshwater ecosystems and prefers stagnant waters, such as small ponds, pools, roadside ditches, marshes, lakes, and reservoirs. It grows over a large pH range (7.3-9.6) and presents a wide tolerance to variation in nutrient type and amount in water. Cells exist either fastened to substrate at the bottom of the water system or free-floating within. When free-floating they form polyalgal patches (mats) on the water's surface to establish a relatively static habitat. Mats are created by interweaving multiple different algal filaments that are suspended in a gelatinous matrix. This matrix is a result of secretions by free floating thalli. Benthic cells are most often juvenile filaments and once matured they tend to let go, float to the top and form the mats. ''Oedogonium'' filaments typically appear during the warmer months, appearing at the end of June (north of the equator), and throughout July and August are found prevalent in polyalgal mats. Messyasz, B., Pikosz, M., Schroeder, G., Łęska, B. & Fabrowska, J. 2015: Identification and Ecology of Macroalgae Species Existing in Poland. Chapter 2, In: S.K. Kim & K. Chojnacka (eds.). Marine Algae Extracts: Processes, Products and Application. Mats formed by ''Oedogonium'' are multi-species, associated with ''Spirogyra'', ''Rhizoclonium'', and ''Cladophora''. Together these species use holdfast cells to grip one another in order to photosynthesize. These mats/patches are also known as algal blooms.Life Cycles
Asexual Reproduction
''Oedogonium'' can reproduce asexually by fragmentation of the filaments, germination of aplanospores and akinetes, and through zoospores. In fragmentation, the filament splits apart and each fragment reproduces to form a fully functioning thallus. Splitting can occur more than once at the same position of the filament, explaining why some cells have more than one cap. The splitting of fragmentation may or may not be intentional – it could occur due to natural damage by the environment or predators. Asexual reproduction via zoospore is also very common and occurs in vegetative (benthic) cells. Vegetative cells produce zoosporangia – the enclosure in which spores are formed – which give rise to the zoospores. EachSexual Reproduction
Sexual reproduction in ''Oedogonium'' is oogamous; and can be monoecious or dioecious. Species may either be macrandrous (lacking dwarf males) or nannandrous (possessing dwarf males). Dwarf males are small, short, antheridium-producing filaments attached near the oogonia (female sex organ). These dwarf males are derived by repeated cell division of multiflagellate androspores. When an oogonial mother cell divides it forms a swollen oogonium bound by a supporting cell. Oogonial cells may exist in a series along the filament, and so division may also occur in a series; resulting in each oogonium containing a single egg. Production of an egg causes swelling of the cell wall, responsible for the name given by Hirn in 1900 – oedos (swelling) and gonos (seed/offspring). Antheridia are short and disk-shaped, containing 1 to 2 multi-flagellated sperm cells. Motile male gametes will exit the antheridia and are chemotactically attracted to oogonia. A single sperm cell will pass through a pore opening in the oogonial cell wall, allowing fertilization. Zygotes (oospores) are initially green but will gradually become an orange-red colour and develop a thick multilayered cell wall with species specific surface adornments. Meiosis occurs in the zygote prior to germination, producing four multi-flagellated cells after germination. Once freed from the oogonium, each daughter cell is only motile for a short period of time. All four cells may eventually attach to a substrate and then divide repeatedly to form new ''Oedogonium'' filament. The life cycle of ''Oedogonium'' is haplontic. The egg from the oogonia and the sperm from the antheridia fuse and form a zygote which is diploid (2n). The zygote then undergoes meiosis and reproduces asexually to form the filamentous green alga which is haploid (1n).Genetics
''Oedogonium'' nuclear genomes are rather unexceptional, and genome size and organisation remain largely unstudied within its phylum. Brouard, J.S., Otis, C., Lemieux, C. and Turmel, M. 2008: Chloroplast DNA sequence of the green alga ''Oedogonium'' cardiacum (Chlorophyceae): Unique genome architecture, derived characters shared with the Chaetophorales and novel genes acquired through horizontal transfer. BMC Genomics. Volume 1, 9:290. ''Oedogonium'' contain chloroplast with very distinct genome architecture. This genome is 196,547bp in length, and is the most compact among photosynthetic chlorophytes. It has a nonconforming quadripartite structure, with 17 group I and 4 group II introns – making it incredibly intron-rich. It has four long open reading frames (ORFs), containing 99 different conserved genes. Two of these ORFs showed high similarities to genes not usually found in cpDNA (chloroplast DNAs). The chloroplastic genome of ''Oedogonium'' reveals character evidence for a close alliance between the OCC clade. Although more data is required to validate these findings, there molecular signatures are strong supports for this dichotomy and for the branching of ''Oedogonium'' as the earliest-diverging lineage of the OCC clade.Practical Importance
Recent studies from 2007 onwards have revealed that ''Oedogonium'' cells have a maximum high heavy metal absorption capacity (qe). The major mechanism of the lead–absorption interaction has been found to be ionic interactions and complex formation between metal cations and ligands contained within the structure of ''Oedogonium'' filaments. The biosorption of heavy metal ions by the ''Oedogoniales'' occur in two stages; an initial rapid uptake due to surface adsorption on the three major cell wall components, and then a subsequent slow uptake due to membrane transport of metal ions to the cytoplasm of the cells. The three cell surfaces of an ''Oedogonium'' filamentous cell consist of polysaccharides, proteins and lipids which provide several functional groups capable of binding to heavy metal ions. ''Oedogonium'' are readily available, non-toxic microorganisms which may be cultivated and/or cultured easily. Due to their position at the surface, algal blooms can block out the sunlight from other organisms and deplete oxygen levels in the water during peak summer months. Each alga included in the bloom is short-lived, and this results in a high concentration of dead organic matter. The decay process consumes dissolved oxygen in the water, resulting in hypoxic conditions. Without enough dissolved oxygen in the water, animals and plants may die off in large numbers. Foster, J.M. 2013: Lake Erie Is Dying Again, and Warmer Waters and Wetter Weather Are To Blame. ClimateProgress. https://thinkprogress.org/lake-erie-is-dying-again-and-warmer-waters-and-wetter-weather-are-to-blame-96956c15f046/; searched on 11 February 2019. When blooms are in effect, removing these cells has a positive effect on their ecosystem and may be dried and used to effectively absorb harmful heavy metals from other freshwater systems such as industrial wastes.''Oedogonium'' can also significantly clog irrigation canals when growth on concrete surfaces becomes excessive due to high levels of benthic filaments. Removal of ''Oedogonium'' from clogged irrigation canals can also prove to be cost effective as they may once again be dried and used for absorption of heavy metals.Species List
This is a list of all accepted ''Oedogonium'' species:Guiry, M.D. & Guiry, G.M. (2019). AlgaeBase. World-wide electronic publication, National University of Ireland, Galway (taxonomic information republished from AlgaeBase with permission of M.D. Guiry). Oedogonium Link ex Hirn, 1900. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=577723 on 2019-04-04A
*''Oedogonium abbreviatum'' (Hirn) Tiffany, 1934 *''Oedogonium ackleyae'' Tiffany *''Oedogonium acmandrium'' Elfving ex Hirn, 1900 *''Oedogonium acrospirum'' Skuja, 1949 *''Oedogonium acrosporum'' De Bary ex Hirn, 1900 *''Oedogonium aculeatum'' C.-C.Jao, 1979 *''Oedogonium acuminatum'' (Hirn) Tiffany *''Oedogonium acutum'' (West & G.S.West) Tiffany *''Oedogonium aequale'' (Hassall) Kützing *''Oedogonium affine'' Kützing *''Oedogonium affine'' (Hassall) Kützing *''Oedogonium agrarium'' H.-Z.Zhu, 1979 *''Oedogonium ahlstrandii'' Wittrock ex Hirn, 1900 *''Oedogonium ahmadii'' Farooq & Faridi *''Oedogonium ahmedabadense'' Kamat *''Oedogonium alatum'' (Hassall) Kützing, 1849 *''Oedogonium alatum'' C.-C.Jao, 1979 *''Oedogonium albertii'' Gauthier-Lièvre *''Oedogonium allorgeanum'' Lacerda *''Oedogonium alpinum'' Kützing *''Oedogonium alsium'' Skuja *''Oedogonium alternans'' Wittrock & P.Lundell ex Hirn, 1900 *''Oedogonium amagerense'' Hallas *''Oedogonium ambiceps'' (Jao) Tiffany *''Oedogonium americanum'' Transeau, 1917 *''Oedogonium amplius'' (W.R.Taylor) Tiffany *''Oedogonium amplum'' Magnus & Wille, 1884 *''Oedogonium amurense'' Skvortzov *''Oedogonium anastomosans'' C.-C.Jao, 1979 *''Oedogonium andinum'' Tutin *''Oedogonium angustissimum'' West & G.S.West ex Hirn, 1900 *''Oedogonium angustistomum'' Hoffman, 1967 *''Oedogonium annulare'' Gonzalves & Jain, 1970 *''Oedogonium anomalum'' Hirn, 1900 *''Oedogonium antillarum'' P.L.Crouan & H.M.Crouan *''Oedogonium apiculatum'' Wolle *''Oedogonium aquaticum'' Kamat, 1963 *''Oedogonium archerianum'' Cooke *''Oedogonium arcyosporum'' Nordstedt, 1900 *''Oedogonium areolatocostatum'' C.-C.Jao, 1979 *''Oedogonium areolatofaveolatum'' C.-C.Jao, 1979 *''Oedogonium areolatum'' Lagerheim ex Hirn, 1900 *''Oedogonium areolatum'' (Singh) Mrozinska, 1985 *''Oedogonium areoliferum'' (C.-C.Jao) Tiffany, 1937 *''Oedogonium areschougii'' Wittrock ex Hirn, 1900 *''Oedogonium argenteum'' Hirn, 1900 *''Oedogonium armigerum'' Hirn, 1900 *''Oedogonium armoricanum'' Villeret *''Oedogonium arnoldii'' Kiselev *''Oedogonium arnoldii'' Roll *''Oedogonium ashihoense'' Skvortzov *''Oedogonium ashihoense'' Skvortzov & Noda *''Oedogonium aster'' Wittrock ex Hirn, 1900 *''Oedogonium aureum'' (Tilden) Tiffany *''Oedogonium australianum'' Hirn, 1900 *''Oedogonium autumnale'' Wittrock ex Hirn, 1900 *''Oedogonium aveirense'' LacerdaB
*''Oedogonium baginiense'' Mrozinska-Webb, 1976 *''Oedogonium bahusiense'' Nordstedt ex Hirn, 1900 *''Oedogonium bancroftii'' Stephen Skinner & Timothy John Entwisle, Entwisle, 2006 *''Oedogonium bathmidosporum'' Nordstedt *''Oedogonium bayanhaoteense'' C.-C.Jao, 1979 *''Oedogonium bengalense'' Hirn, 1900 *''Oedogonium berolinense'' Wittrock *''Oedogonium bharatense'' Gonzalves & Sonnad *''Oedogonium bharuchae'' Kamat *''Oedogonium biforme'' Nordstedt ex Hirn, 1900 *''Oedogonium bohemicum'' Hirn, 1900 *''Oedogonium bombycinum'' (Bory) Montagne *''Oedogonium boreale'' Hirn, 1900 *''Oedogonium borgei'' (Hirn) Tiffany, 1934 *''Oedogonium borisianum'' Wittrock ex Hirn, 1900 *''Oedogonium borisii'' (Lecl.) Kützing *''Oedogonium boscii'' Wittrock ex Hirn, 1900 *''Oedogonium bourrellyanum'' Villeret, 1951 *''Oedogonium boyanum'' Claassen *''Oedogonium brasilense'' Borge ex Hirn, 1900 *''Oedogonium braunii'' Kützing ex Hirn, 1900 *''Oedogonium breve'' C.-C.Jao, 1979 *''Oedogonium brevicingulatum'' C.-C.Jao, 1935 *''Oedogonium brevifilum'' C.-C.Jao, 1979 *''Oedogonium brittonii'' Tiffany, 1936 *''Oedogonium broterianum'' Lacerda, 1945 *''Oedogonium brunelii'' Gonzalves & JainC
*''Oedogonium caespitosum'' P.L.Crouan & H.M.Crouan *''Oedogonium calcareum'' Cleve & Wittrock, 1900 *''Oedogonium calcareum'' Ripart, 1876 *''Oedogonium calliosporum'' C.-C.Jao, 1979 *''Oedogonium calosporum'' Hirn *''Oedogonium calosporum'' C.C.Jao, 1936 *''Oedogonium calvum'' Wittrock ex Hirn, 1900 *''Oedogonium calyptratum'' C.-C.Jao, 1979 *''Oedogonium canadense'' (Tiffany) Tiffany *''Oedogonium candollei'' Kützing *''Oedogonium cantonense'' S.-H.Ley, 1949 *''Oedogonium capense'' Nordstedt & Hirn, 1900 *''Oedogonium capillaceum'' Kützing *''Oedogonium capillare'' Kützing ex Hirn, 1900 *''Oedogonium capilliforme'' Kützing ex Hirn, 1900 *''Oedogonium capitellatum'' Wittrock ex Hirn, 1900 *''Oedogonium capricornicum'' Stephen Skinner & Timothy John Entwisle, Entwisle, 2006 *''Oedogonium carbonicum'' Wittrock *''Oedogonium cardiacum'' Wittrock ex Hirn, 1900 *''Oedogonium caricosum'' C.-C.Jao, 1979 *''Oedogonium carinatum'' C.-C.Jao, 1979 *''Oedogonium carolinianum'' Tiffany *''Oedogonium catenatum'' H.-Z.Zhu, 1964 *''Oedogonium catenulatum'' Kützing *''Oedogonium catenulum'' Kützing *''Oedogonium cearense'' Tiffany, 1937 *''Oedogonium cerasinum'' Stephen Skinner & Entwisle, 2006 *''Oedogonium chapmanii'' Tiffany *''Oedogonium charkoviense'' Arnoldi & Y.V.Roll, 1939 *''Oedogonium chengkiangense'' C.-C.Jao, 1979 *''Oedogonium chowdarii'' J.P.Keshri, 2012 *''Oedogonium chungkingense'' (C.-C.Jao) C.-C.Jao, 1936 *''Oedogonium ciliare'' de Notaris *''Oedogonium ciliatum'' Pringsheim ex Hirn, 1900 *''Oedogonium circinatum'' Tiffany *''Oedogonium circumlineatum'' M.E.Britton *''Oedogonium circumplicatum'' Margalef *''Oedogonium citriforme'' Hallas *''Oedogonium clavatum'' Hallas, 1905 *''Oedogonium cleveanum'' Wittrock ex Hirn, 1900 *''Oedogonium cloverae'' Lillick *''Oedogonium collinsii'' Tiffany *''Oedogonium columbianum'' (G.West) Tiffany *''Oedogonium commune'' (Hirn) Tiffany *''Oedogonium completum'' (Hirn) Tiffany *''Oedogonium compressum'' (Hassall) Kützing *''Oedogonium concatenatum'' Wittrock ex Hirn, 1900 *''Oedogonium confertum'' Hirn, 1900 *''Oedogonium conflectum'' C.-C.Jao, 1979 *''Oedogonium congolense'' Gauthier-Lièvre, 1964 *''Oedogonium consociatum'' Collins & Hervey, 1917 *''Oedogonium constrictum'' C.-C.Jao, 1976 *''Oedogonium contortum'' Hallas, 1905 *''Oedogonium corrugatum'' C.-C.Jao, 1979 *''Oedogonium costatosporum'' C.-C.Jao, 1934 *''Oedogonium costatum'' Transeau, 1930 *''Oedogonium costulatum'' C.-C.Jao, 1979 *''Oedogonium crassidens'' C.-C.Jao, 1936 *''Oedogonium crassiusculum'' Wittrock ex Hirn, 1900 *''Oedogonium crassum'' Wittrock ex Hirn, 1900 *''Oedogonium crenulatocostatum'' Wittrock ex Hirn, 1900 *''Oedogonium crenulatum'' Wittrock ex Hirn, 1900 *''Oedogonium cribbianum'' Stephen Skinner & Entwisle, 2006 *''Oedogonium crispulum'' Wittrock & Nordstedt *''Oedogonium crispum'' Wittrock ex Hirn, 1900 *''Oedogonium croasdalea'' C.C.Jao *''Oedogonium croasdaleae'' C.C.Jao *''Oedogonium croceum'' C.-C.Jao, 1979 *''Oedogonium cryptoporum'' Wittrock ex Hirn, 1900 *''Oedogonium curtum'' Wittrock & P.Lundell ex Hirn, 1900 *''Oedogonium curvum'' Pringsheim ex Hirn, 1900 *''Oedogonium cuspidatum'' Kützing *''Oedogonium cuvieri'' (Le Clerc) Kützing *''Oedogonium cyathigerum'' Wittrock ex Hirn, 1900 *''Oedogonium cyclostomum'' Gauthier-Lièvre, 1964 *''Oedogonium cylindricum'' C.-C.Jao, 1942 *''Oedogonium cylindrosporum'' C.-C.Jao, 1979 *''Oedogonium cymatosporum'' Wittrock & Norstedt, 1900D
*''Oedogonium dacchense'' Islam & Sarma, 1963 *''Oedogonium danicum'' Hallas, 1905 *''Oedogonium dawsonii'' Prescott, 1957 *''Oedogonium debaryanum'' Chmielevsky *''Oedogonium decaryi'' Gauthier-Lièvre *''Oedogonium decipiens'' Wittrock ex Hirn, 1900 *''Oedogonium delacerdanum'' Villeret, 1951 *''Oedogonium delicatulum'' Kützing *''Oedogonium demaretianum'' Compère, 1976 *''Oedogonium densioculum'' C.-C.Jao, 1979 *''Oedogonium densum'' C.-C.Jao, 1979 *''Oedogonium dentireticulatum'' C.-C.Jao, 1936 *''Oedogonium dentireticulosporum'' Gonzalves & Jain *''Oedogonium depressum'' Pringsheim ex Hirn, 1900 *''Oedogonium desikacharyi'' Khan & Kukreti *''Oedogonium desikacharyi'' Gonzalves & Jain *''Oedogonium detonii'' González Guerrero *''Oedogonium de-tonii'' P.González, 1964 *''Oedogonium dictyosporum'' Wittrock ex Hirn, 1900 *''Oedogonium didymosporum'' Montagne *''Oedogonium didymum'' Novis *''Oedogonium dimorphum'' C.-C.Jao, 1979 *''Oedogonium dioicum'' H.J.Carter ex Hirn, 1900 *''Oedogonium dioicum'' Pétrovsky *''Oedogonium diplandrum'' Jurányi *''Oedogonium discretum'' Tiffany, 1951 *''Oedogonium dissimile'' C.-C.Jao, 1979 *''Oedogonium diversum'' (Hirn) Tiffany *''Oedogonium doliiforme'' C.-C.Jao, 1979 *''Oedogonium donnellii'' Wolle ex Hirn, 1900 *''Oedogonium drouetii'' Tiffany *''Oedogonium dubium'' Kützing *''Oedogonium dubium'' (Hassall) Kützing *''Oedogonium dungchwanense'' C.-C.Jao, 1979E
*''Oedogonium echinatum'' Wittrock ex Hirn, 1900 *''Oedogonium echinatum'' H.C.Wood *''Oedogonium echinospermum'' A.Braun ex Hirn, 1900 *''Oedogonium echinospirale'' Lacerda, 1946 *''Oedogonium echinosporum'' A.Braun *''Oedogonium elegans'' Kützing, 1849 *''Oedogonium elegans'' West & G.S.West, 1902 *''Oedogonium elegans'' Skvortzov, 1946 *''Oedogonium ellipsoideum'' R.N.Singh *''Oedogonium ellipsosporum'' R.N.Singh, 1938 *''Oedogonium eminens'' (Hirn) Tiffany, 1934 *''Oedogonium epiphyticum'' Transeau & Tiffany, 1934 *''Oedogonium epiphyticum'' Skvortzov *''Oedogonium epiphyticum'' Skvortzov & Noda *''Oedogonium erceense'' Villeret *''Oedogonium eremitum'' Hallas *''Oedogonium eriense'' Tiffany, 1936 *''Oedogonium erythrospermum'' Montagne *''Oedogonium estarrejae'' Lacerda *''Oedogonium euganeorum'' Wittrock *''Oedogonium excavatum'' C.-C.Jao, 1934 *''Oedogonium excentriporum'' (C.-C.Jao) Tiffany, 1937 *''Oedogonium excisum'' Wittrock & P.Lundell ex Hirn, 1900 *''Oedogonium excitans'' H.Szymanska *''Oedogonium exiguum'' Elfving *''Oedogonium exile'' Ley *''Oedogonium exmonile'' Tiffany *''Oedogonium exocostatum'' Tiffany, 1921 *''Oedogonium exospirale'' Tiffany, 1924 *''Oedogonium exostriatum'' Tiffany *''Oedogonium exoticum'' (Hirn) TiffanyF
*''Oedogonium fabulosum'' Hirn, 1900 *''Oedogonium fallax'' Skvortzov *''Oedogonium fallax'' Skvortzov & Noda *''Oedogonium fanii'' C.-C.Jao, 1938 *''Oedogonium fasciatum'' (Hassall) Kützing, 1849 *''Oedogonium fasciculare'' P.L.Crouan & H.M.Crouan *''Oedogonium fasciculum'' H.-Z.Zhu, 1964 *''Oedogonium fecundum'' C.-C.Jao, 1979 *''Oedogonium fennicum'' (Tiffany) Tiffany *''Oedogonium figueirense'' Lacerda *''Oedogonium figuratum'' Tiffany, 1936 *''Oedogonium fioniae'' Hallas *''Oedogonium flavescens'' Wittrock ex Hirn, 1900 *''Oedogonium flexuosum'' Hirn, 1900 *''Oedogonium fluitans'' P.L.Crouan & H.M.Crouan *''Oedogonium fonticola'' A.Braun ex Hirn, 1900 *''Oedogonium fontinale'' *''Oedogonium formosum'' Kamat *''Oedogonium fossum'' Skvortzov & Noda *''Oedogonium foveolatum'' Wittrock ex Hirn, 1900 *''Oedogonium fragile'' Wittrock ex Hirn, 1900 *''Oedogonium franconicum'' O.Bock & W.Bock, 1954 *''Oedogonium frankilianum'' *''Oedogonium franklinianum'' Wittrock ex Hirn, 1900 *''Oedogonium fremyi'' Gauthier-Lièvre, 1963 *''Oedogonium fructiferum'' Skvortzov & Noda *''Oedogonium fructum'' Leiblein *''Oedogonium fugacissimum'' (Roth) Rabenhorst *''Oedogonium fuscescens'' (Kützing) Kützing *''Oedogonium fuscolutescens'' Sprée *''Oedogonium fuscum'' C.E.Taft *''Oedogonium fusus'' Hallas, 1905G
*''Oedogonium gallaecicum'' Margalef *''Oedogonium gallicum'' Hirn, 1900 *''Oedogonium gelatinosum'' Kamat *''Oedogonium gemelliparum'' Pringsheim *''Oedogonium geminatum'' Kamat *''Oedogonium geniculatum'' Hirn ex Hirn, 1900 *''Oedogonium giganteum'' Kützing ex Hirn, 1900 *''Oedogonium glabrum'' Hallas, 1905 *''Oedogonium glabrum'' Randhawa, 1936 *''Oedogonium globosum'' Nordstedt ex Hirn, 1900 *''Oedogonium goniatum'' C.-C.Jao, 1979 *''Oedogonium gonzalvesiae'' Islam & P.Sarma *''Oedogonium gonzalvesiae'' Khan & Kukreti *''Oedogonium gorakhporense'' R.H.Singh *''Oedogonium gracile'' Kützing *''Oedogonium gracilius'' Tiffany, 1934 *''Oedogonium gracillimum'' Wittrock & P.Lundell ex Hirn, 1900 *''Oedogonium grande'' Kützing ex Hirn, 1900 *''Oedogonium granulosporum'' Lacerda *''Oedogonium gujaratense'' Kamat, 1962 *''Oedogonium gunnii'' Wittrock ex Hirn, 1900H
*''Oedogonium haimenense'' C.-C.Jao, 1938 *''Oedogonium hallasiae'' Tiffany *''Oedogonium hanchwanense'' C.-C.Jao, 1979 *''Oedogonium hardyi'' Stephen Skinner & Entwisle, 2006 *''Oedogonium harjedalicum'' Cedergren *''Oedogonium hatei'' Kamat, 1963 *''Oedogonium heilungkiangense'' C.-C.Jao, 1979 *''Oedogonium heimii'' Gauthier-Lièvre, 1964 *''Oedogonium henriquesii'' Lacerda *''Oedogonium heterogonium'' Kützing *''Oedogonium hians'' Nordstedt & Hirn, 1900 *''Oedogonium hindustanense'' Kamat, 1963 *''Oedogonium hirnii'' Gutwinski ex Hirn, 1900 *''Oedogonium hispidum'' Nordstedt ex Hirn, 1900 *''Oedogonium hoehnei'' Borge, 1925 *''Oedogonium hoersholmiense'' Hallas, 1905 *''Oedogonium holsaticum'' Kützing *''Oedogonium howei'' Tiffany, 1936 *''Oedogonium hsinganicum'' Skvortzov & Noda *''Oedogonium hsingianicum'' Skvortzov *''Oedogonium huillense'' West & G.S.West *''Oedogonium humbertii'' Gauthier-Lièvre, 1964 *''Oedogonium humile'' C.-C.Jao, 1979 *''Oedogonium hunanense'' C.-C.Jao, 1938 *''Oedogonium huntii'' H.C.Wood ex Hirn, 1900 *''Oedogonium hystricinum'' Transeau & Tiffany, 1919 *''Oedogonium hystrix'' Wittrock ex Hirn, 1900I
*''Oedogonium ibadanense'' Gauthier-Lièvre *''Oedogonium idioandrosporum'' (Nordstedt & Wittrock ex Hirn) Tiffany, 1934 *''Oedogonium illinoisense'' Transeau, 1914 *''Oedogonium ilsteri'' Skuja, 1934 *''Oedogonium imahorii'' Kamat *''Oedogonium implexum'' Hirn, 1900 *''Oedogonium inaequale'' (Hassall) Kützing *''Oedogonium inaequale'' H.C.Wood, 1869 *''Oedogonium incertum'' Tiffany *''Oedogonium inclusum'' Hirn *''Oedogonium inconspicuum'' Hirn, 1900 *''Oedogonium incrassatum'' Hallas ex Andersen, 1945 *''Oedogonium indianense'' Britton & B.M.Smith, 1935 *''Oedogonium indicum'' Hirn, 1900 *''Oedogonium inerme'' Hirn, 1900 *''Oedogonium infimum'' Tiffany *''Oedogonium infirmum'' Tiffany, 1924 *''Oedogonium inflatum'' Hallas, 1905 *''Oedogonium inframediale'' C.-C.Jao, 1935 *''Oedogonium insigne'' Hirn, 1900 *''Oedogonium intermedium'' Wittrock ex Hirn, 1900 *''Oedogonium inversum'' Wittrock ex Hirn, 1900 *''Oedogonium iowense'' Tiffany, 1924 *''Oedogonium irregulare'' Wittrock ex Hirn, 1900 *''Oedogonium ituriense'' Gauthier-Lièvre, 1964 *''Oedogonium itzigsohnii'' De Bary ex Hirn, 1900 *''Oedogonium iyengarii'' Gonzalves & JainJ
*''Oedogonium jaoi'' Tiffany *''Oedogonium jaoi'' Mrozinska *''Oedogonium jharkhandense'' P.Mahato & A.K.Mahato *''Oedogonium jordanovii'' VodenicharovK
*''Oedogonium keralense'' N.A.Erady & K.Rajappan *''Oedogonium khannae'' Skuja, 1949 *''Oedogonium kiangchwanense'' C.-C.Jao, 1979 *''Oedogonium kiayuanense'' C.-C.Jao, 1979 *''Oedogonium kirchneri'' Wittrock ex Hirn, 1900 *''Oedogonium kirtikarii'' Kamat, 1963 *''Oedogonium kitutae'' G.S.West, 1907 *''Oedogonium kjellmanii'' Wittrock ex Hirn, 1900 *''Oedogonium koechlinii'' Gauthier-Lièvre, 1964 *''Oedogonium kolhapurense'' Kamat, 1963 *''Oedogonium kozminskii'' Prescott *''Oedogonium kufferathii'' Gauthier-Lièvre, 1964 *''Oedogonium kunmingense'' H.-Z.Zhu, 1964 *''Oedogonium kurzii'' Zeller ex Hirn, 1900 *''Oedogonium kushmiense'' R.N.Singh *''Oedogonium kwangsiense'' C.-C.Jao, 1947 *''Oedogonium kwangtungense'' S.-H.Ley, 1949L
*''Oedogonium lacustre'' (Hassall) Rabenhorst *''Oedogonium laetevirens'' P.L.Crouan & H.M.Crouan, 1878 *''Oedogonium laetevirens'' Wittrock ex Hirn, 1900 *''Oedogonium laetivirens'' P.L.Crouan & H.M.Crouan *''Oedogonium laeve'' Wittrock ex Hirn, 1900 *''Oedogonium lageniforme'' Hirn, 1900 *''Oedogonium lagerheimii'' Wittrock *''Oedogonium lagerstedetii'' Wittrock ex Hirn, 1900 *''Oedogonium lagerstedtii'' Wittrock ex Hirn, 1900 *''Oedogonium landsboroughii'' Wittrock ex Hirn, 1900 *''Oedogonium lanternoides'' C.-C.Jao, 1979 *''Oedogonium laporteanum'' M.E.Britton *''Oedogonium laschii'' Rabenhorst *''Oedogonium laticircellum'' C.-C.Jao, 1979 *''Oedogonium latiusculum'' Tiffany, 1924 *''Oedogonium latviense'' (Tiffany) Tiffany *''Oedogonium lautumniarium'' *''Oedogonium lautumniarum'' Wittrock ex Hirn, 1900 *''Oedogonium leiopleurum'' Nordstedt & Hirn, 1900 *''Oedogonium leiriense'' Lacerda *''Oedogonium lemmermannii'' Tiffany, 1934 *''Oedogonium lindmanianum'' Wittrock ex Hirn, 1900 *''Oedogonium lisbonense'' Lacerda, 1949 *''Oedogonium londinense'' Wittrock ex Hirn, 1900 *''Oedogonium longatum'' Kützing ex Hirn, 1900 *''Oedogonium longiarticulatum'' (Hansgirg) Tiffany *''Oedogonium longicolle'' Nordstedt ex Hirn, 1900 *''Oedogonium longipilum'' C.-C.Jao, 1937 *''Oedogonium longisporum'' Gauthier-Lièvre, 1964 *''Oedogonium longum'' (Transeau) Tiffany *''Oedogonium lopesianum'' Lacerda *''Oedogonium lorentzii'' Wille *''Oedogonium loricatum'' Hirn ex Hirn, 1900 *''Oedogonium louisianense'' Taft, 1946 *''Oedogonium lucens'' Zanardini *''Oedogonium luisierianum'' Lacerda, 1958 *''Oedogonium lusitanicum'' LacerdaM
*''Oedogonium macrandrium'' Wittrock ex Hirn, 1900 *''Oedogonium macrandrum'' Wittrock *''Oedogonium macrospermum'' West & G.S.West ex Hirn, 1900 *''Oedogonium macrosporum'' P.L.Crouan & H.M.Crouan *''Oedogonium magnusii'' Wittrock ex Hirn, 1900 *''Oedogonium maharastrense'' Kamat, 1963 *''Oedogonium majus'' (Hansgirg) Tiffany *''Oedogonium mammiferum'' Wittrock ex Hirn, 1900 *''Oedogonium manschuricum'' Skvortzov, 1926 *''Oedogonium margaritiferum'' Nordstedt & Hirn, 1900 *''Oedogonium marinum'' Kützing *''Oedogonium martinicense'' Hirn, 1900 *''Oedogonium mattiei'' Claassen *''Oedogonium matvienkoi'' Y.V.Roll, 1948 *''Oedogonium maximum'' West & G.S.West, 1901 *''Oedogonium mediale'' Tiffany, 1937 *''Oedogonium megaporum'' *''Oedogonium megasporum'' Wittrock ex Hirn, 1900 *''Oedogonium meneghinianum'' Kützing *''Oedogonium meridionale'' Arnoldi & Y.V.Roll, 1939 *''Oedogonium mesianum'' Claassen *''Oedogonium mesoreticulatum'' J.P.Keshri, 2012 *''Oedogonium mesospirale'' R.N.Singh *''Oedogonium mexicanum'' Wittrock ex Hirn, 1900 *''Oedogonium michiganense'' Tiffany, 1927 *''Oedogonium micraster'' C.-C.Jao, 1979 *''Oedogonium microdictyon'' C.-C.Jao, 1979 *''Oedogonium microgonium'' Prescott, 1944 *''Oedogonium midnapurense'' J.P.Keshri, 2012 *''Oedogonium minisporum'' Taft, 1939 *''Oedogonium minus'' Wittrock ex Hirn, 1900 *''Oedogonium minutum'' Kützing *''Oedogonium mirabile'' H.C.Wood, 1869 *''Oedogonium mirandrium'' Skuja, 1927 *''Oedogonium mirificum'' H.-Z.Zhu, 1964 *''Oedogonium mirpurense'' Islam, 1965 *''Oedogonium mitratum'' Hirn, 1900 *''Oedogonium moebiusii'' Skinner & Entwisle, 2006 *''Oedogonium monile'' Berkeley & Harvey ex Hirn, 1900 *''Oedogonium moniliforme'' Wittrock ex Hirn, 1900 *''Oedogonium monodii'' Gauthier-Lièvre, 1964 *''Oedogonium montagnei'' Fiorini-Mazzanti ex Hirn, 1900 *''Oedogonium muelleri'' (Hassall) Kützing *''Oedogonium multiplex'' Skvortzov *''Oedogonium multiplex'' Skvortzov & Noda *''Oedogonium multisporum'' H.C.Wood ex Hirn, 1900 *''Oedogonium muratii'' Gauthier-Lièvre, 1964 *''Oedogonium murense'' Lazar *''Oedogonium mutabile'' C.-C.Jao, 1979N
*''Oedogonium nagii'' Chaudhuri *''Oedogonium nankingense'' C.-C.Jao, 1937 *''Oedogonium nanum'' Wittrock ex Hirn, 1900 *''Oedogonium nebraskense'' Ohashi, 1926 *''Oedogonium neomitratum'' C.C.Jao *''Oedogonium nigeriense'' Gauthier-Lièvre, 1964 *''Oedogonium nigrum'' Lacerda, 1946 *''Oedogonium nitellae'' H.-Z.Zhu, 1964 *''Oedogonium nitidum'' C.-C.Jao, 1947 *''Oedogonium nobile'' Wittrock ex Hirn, 1900 *''Oedogonium nodosum'' Kützing *''Oedogonium nodulosum'' Wittrock ex Hirn, 1900 *''Oedogonium nordstedtii'' WittrockO
*''Oedogonium obesum'' Hirn, 1900 *''Oedogonium oblongellum'' Kirchner, 1900 *''Oedogonium oblongum'' Wittrock ex Hirn, 1900 *''Oedogonium obovatum'' C.-C.Jao, 1979 *''Oedogonium oboviforme'' Wittrock ex Hirn, 1900 *''Oedogonium obpyriforme'' C.-C.Jao, 1979 *''Oedogonium obsidionale'' Cornu *''Oedogonium obsoletum'' Wittrock ex Hirn, 1900 *''Oedogonium obtruncatum'' Wittrock ex Hirn, 1900 *''Oedogonium occidentale'' (Hirn) Tiffany, 1934 *''Oedogonium ocellatum'' C.-C.Jao, 1979 *''Oedogonium ochroleucum'' (Berk.) Kützing *''Oedogonium octagonum'' C.-C.Jao, 1979 *''Oedogonium oelandicum'' Wittrock ex Hirn, 1900 *''Oedogonium operculatum'' Tiffany, 1936 *''Oedogonium opisthostomum'' Skuja, 1949 *''Oedogonium orientale'' C.-C.Jao, 1934 *''Oedogonium orientale'' (Skvortzov) Skvortzov *''Oedogonium ornatum'' Hirn, 1896 *''Oedogonium ornatum'' Arnoldi & Y.V.Roll, 1939 *''Oedogonium oryzae'' Wittrock ex Hirn, 1900 *''Oedogonium ouchitanum'' C.E.Taft, 1935 *''Oedogonium ovatum'' (Hassall) Kützing *''Oedogonium oviforme'' Hirn, 1900 *''Oedogonium ovoidosporum'' Arnoldi & Y.V.Roll, 1939 *''Oedogonium oyei'' Kamat, 1963P
*''Oedogonium pachyandrium'' Wittrock ex Hirn, 1900 *''Oedogonium pachydermum'' Wittrock & P.Lundell ex Hirn, 1900 *''Oedogonium pakistanense'' Islam & P.Sarma, 1963 *''Oedogonium palaiense'' Chacko *''Oedogonium pallidum'' Kützing *''Oedogonium paloense'' M.E.Britton, 1948 *''Oedogonium paludosum'' Wittrock ex Hirn, 1900 *''Oedogonium pandeyi'' J.P.Keshri, 2012 *''Oedogonium paradoxum'' C.-C.Jao, 1979 *''Oedogonium paraguayense'' Tiffany *''Oedogonium parasiticum'' (cag) Rabenhorst *''Oedogonium parreticulatum'' C.C.Jao *''Oedogonium parthasarathii'' P.Sarma, D.Mukherjee & A.K.Chakrabarty *''Oedogonium parvulum'' Kützing *''Oedogonium parvulum'' Wodenitscharov *''Oedogonium parvum'' C.-C.Jao, 1936 *''Oedogonium patulum'' Tiffany, 1934 *''Oedogonium paucicostdtum'' *''Oedogonium paucocostatum'' Transeau, 1914 *''Oedogonium paucostriatum'' Tiffany *''Oedogonium paulense'' Nordstedt & Hirn, 1900 *''Oedogonium peipingense'' C.-C.Jao, 1935 *''Oedogonium perpusillum'' Skvortzov *''Oedogonium perreticulatum'' C.-C.Jao, 1979 *''Oedogonium perspicuum'' Hirn, 1900 *''Oedogonium petri'' Wittrock ex Hirn, 1900 *''Oedogonium philippinense'' M.E.Britton, 1948 *''Oedogonium pilbaranum'' Stephen Skinner & Entwisle, 2006 *''Oedogonium piliferum'' Auerswald *''Oedogonium piliferum'' Wittrock *''Oedogonium pilosporum'' West ex Hirn, 1900 *''Oedogonium pisanum'' Wittrock ex Hirn, 1900 *''Oedogonium pitotianum'' Gauthier-Lièvre *''Oedogonium placentulum'' Skvortzov *''Oedogonium placentulum'' Skvortzov & Noda *''Oedogonium plagiostomum'' Wittrock ex Hirn, 1900 *''Oedogonium plicatulum'' Wittrock ex Hirn, 1900 *''Oedogonium pliciferum'' C.-C.Jao, 1979 *''Oedogonium plurisporum'' Arnoldi & Roll *''Oedogonium plurisporum'' Wittrock ex Hirn, 1900 *''Oedogonium plusiosporum'' Wittrock ex Hirn, 1900 *''Oedogonium pluviale'' Nordstedt ex Hirn, 1900 *''Oedogonium poecilosporum'' Nordstedt & Hirn, 1900 *''Oedogonium polistandrium'' H.-Z.Zhu, 1979 *''Oedogonium polyandrium'' Prescott *''Oedogonium polymorphum'' Wittrock & Lundell *''Oedogonium polyspermum'' C.-C.Jao, 1979 *''Oedogonium porrectum'' Nordstedt & Hirn, 1900 *''Oedogonium praelongum'' Hallas, 1945 *''Oedogonium pratense'' Transeau, 1914 *''Oedogonium praticola'' Transeau, 1900 *''Oedogonium pratinaequalense'' M.E.Britton *''Oedogonium prescottii'' Kamat *''Oedogonium princeps'' Wittrock ex Hirn, 1900 *''Oedogonium pringsheimianum'' Archer *''Oedogonium pringsheimii'' C.E.Cramer ex Hirn, 1900 *''Oedogonium propinquum'' Wittrock *''Oedogonium psaegmatosporum'' Nordstedt ex Hirn, 1900 *''Oedogonium pseudacrosporum'' Wittrock, 1900 *''Oedogonium pseudareolatum'' C.-C.Jao, 1979 *''Oedogonium pseudaureum'' C.C.Jao *''Oedogonium pseudoareachougii'' Gauthier-Lièvre *''Oedogonium pseudoboscii'' Hirn, 1900 *''Oedogonium pseudocleveanum'' Gauthier-Lièvre, 1964 *''Oedogonium pseudodentireticulatum'' Gauthier-Lièvre *''Oedogonium pseudofragile'' Claassen *''Oedogonium pseudogunnii'' C.-C.Jao, 1979 *''Oedogonium pseudohirnii'' C.-C.Jao, 1979 *''Oedogonium pseudohowardii'' C.-C.Jao, 1979 *''Oedogonium pseudomitratum'' A.M.Scott & Prescott, 1958 *''Oedogonium pseudomitratum'' C.-C.Jao, 1979 *''Oedogonium pseudopachydermum'' J.P.Keshri, 2012 *''Oedogonium pseudoplenum'' Tiffany *''Oedogonium pseudorothii'' C.-C.Jao, 1979 *''Oedogonium pseudorugulosun'' C.-C.Jao, 1938 *''Oedogonium pseudospirale'' Nygaard, 1932 *''Oedogonium pseudostarmachii'' J.P.Keshri, 2012 *''Oedogonium pseudosuecicum'' H.-Z.Zhu, 1979 *''Oedogonium pseudotumidulum'' Gauthier-Lièvre, 1964 *''Oedogonium pudicum'' Tiffany, 1951 *''Oedogonium puellae'' Skvortzov *''Oedogonium pulchellum'' (Hassall) Kützing *''Oedogonium pulchrum'' Nordstedt & Hirn, 1900 *''Oedogonium pullum'' Skvortzov & Noda *''Oedogonium punctatostriatum'' De Bary ex Hirn, 1900 *''Oedogonium punctatum'' Wittrock ex Hirn, 1900 *''Oedogonium pungens'' Hirn, 1900 *''Oedogonium pusillum'' Kirchner ex Hirn, 1900 *''Oedogonium pygmaeum'' Gonzalves & Jain *''Oedogonium pyrisporum'' Kiselev *''Oedogonium pyrulum'' Wittrock ex Hirn, 1900Q
*''Oedogonium quadratum'' Hallas, 1905 *''Oedogonium quezelii'' Gauthier-Lièvre, 1964 *''Oedogonium quintanilhae'' Lacerda, 1946R
*''Oedogonium raikwarii'' Khan & Kukreti *''Oedogonium ralfsii'' (Hassall) Kützing *''Oedogonium randhawae'' Venkataraman *''Oedogonium rarissimum'' Skvortzov *''Oedogonium rarissimum'' Skvortzov & Noda *''Oedogonium reductum'' Taft, 1946 *''Oedogonium regium'' E.O.Hughes *''Oedogonium regium'' Hughes *''Oedogonium reinschii'' J.Roy ex Hirn, 1900 *''Oedogonium repandum'' C.-C.Jao, 1979 *''Oedogonium repens'' Kamat *''Oedogonium reticulatonervatum'' C.C.Jao *''Oedogonium reticulatum'' West & G.S.West, 1902 *''Oedogonium reticulocostatum'' C.-C.Jao *''Oedogonium reticulonervatum'' C.-C.Jao, 1979 *''Oedogonium reticulosporum'' Mrozinska, 1960 *''Oedogonium rhodosporum'' Wittrock ex Hirn, 1900 *''Oedogonium richterianum'' Nayal *''Oedogonium richterianum'' Lemmermann ex Hirn, 1900 *''Oedogonium rigidum'' Hirn, 1900 *''Oedogonium ringens'' Hoffman *''Oedogonium ripartii'' De Toni *''Oedogonium rivulare'' A.Braun ex Hirn, 1900 *''Oedogonium rosenvingii'' Hallas *''Oedogonium rostellatum'' Pringsheim *''Oedogonium rothii'' Pringsheim ex Hirn, 1900 *''Oedogonium rufescens'' Wittrock ex Hirn, 1900 *''Oedogonium rugulosum'' Nordstedt ex Hirn, 1900 *''Oedogonium rupestre'' Hirn, 1900S
*''Oedogonium salinum'' C.-C.Jao, 1979 *''Oedogonium sanctithomae'' Wittrock & Cleve ex Hirn, 1900 *''Oedogonium santapaui'' Kamat *''Oedogonium santurcense'' Tiffany, 1936 *''Oedogonium sawyeri'' Prescott *''Oedogonium saxatile'' Hansgirg, 1901 *''Oedogonium schmidlei'' Gutwinski ex Hirn, 1900 *''Oedogonium schweickerdtii'' Cholnoky, 1952 *''Oedogonium scrobiculatum'' Wittrock ex Hirn, 1900 *''Oedogonium scutatum'' Kützing *''Oedogonium selandiae'' Hallas, 1905 *''Oedogonium seligeriense'' Arnoldi & Y.V.Roll, 1939 *''Oedogonium semiapertum'' Nordstedt & Hirn, 1900 *''Oedogonium setigerum'' Wolle *''Oedogonium setigerum'' Hoffman *''Oedogonium sexangulare'' Cleve ex Hirn, 1900 *''Oedogonium shantungense'' C.-C.Jao, 1979 *''Oedogonium shanxiense'' Y.J.Ling & S.L.Xie, 1999 *''Oedogonium silvaticum'' Hallas, 1905 *''Oedogonium simplex'' Hirn, 1900 *''Oedogonium sinense'' L.C.Li, 1933 *''Oedogonium sinensis'' *''Oedogonium singhbhumense'' P.Mahato & A.K.Mahato *''Oedogonium singhii'' Kamat *''Oedogonium singulare'' Kamat, 1962 *''Oedogonium sinuatum'' Transeau *''Oedogonium skujae'' J.P.Keshri, 2012 *''Oedogonium smithii'' Prescott, 1944 *''Oedogonium sociale'' Wittrock ex Hirn, 1900 *''Oedogonium sodiroanum'' Lagerheim ex Hirn, 1900 *''Oedogonium sol'' Hirn, 1900 *''Oedogonium soldatovii'' Skvortzov *''Oedogonium sordidum'' (Roth) Kützing *''Oedogonium southlandiae'' Novis *''Oedogonium spachtii'' Scott & Prescott *''Oedogonium spechtii'' A.M.Scott & Prescott *''Oedogonium speciosum'' S.-H.Ley, 1949 *''Oedogonium spectabile'' Hirn, 1900 *''Oedogonium spetsbergense'' Wittrock *''Oedogonium sphaerandrum'' Wittrock & Lundell ex Hirn, 1900 *''Oedogonium sphaericoinconspicuum'' H.Silva, 1953 *''Oedogonium sphaericum'' (Hassall) Kützing *''Oedogonium sphaerocephalum'' Gauthier-Lièvre *''Oedogonium sphaeroideum'' Prescott, 1944 *''Oedogonium spheroideum'' Prescott *''Oedogonium spinospermum'' Reinsch *''Oedogonium spinosporum'' Gonzalves & Jain *''Oedogonium spinosum'' Gonzalves & Sonnad, 1961 *''Oedogonium spirale'' Hirn, 1900 *''Oedogonium spiralidens'' C.-C.Jao, 1934 *''Oedogonium spiripennatum'' C.-C.Jao, 1934 *''Oedogonium spirostriatum'' Tiffany *''Oedogonium spurium'' Hirn, 1900 *''Oedogonium stagnale'' Kützing *''Oedogonium starmachii'' Mrozinska, 1958 *''Oedogonium stellatum'' Wittrock ex Hirn, 1900 *''Oedogonium stephensiae'' Tiffany, 1936 *''Oedogonium stictospermum'' (Skuja) Tiffany, 1949 *''Oedogonium striatum'' Randhawa *''Oedogonium subacrosporum'' Gauthier-Lièvre, 1964 *''Oedogonium subareolatum'' Tiffany, 1936 *''Oedogonium subcapitellatum'' Hirn *''Oedogonium subcymatosporum'' C.-C.Jao, 1936 *''Oedogonium subdentireticulatum'' C.-C.Jao, 1979 *''Oedogonium subdepressum'' C.-C.Jao, 1937 *''Oedogonium subdissimile'' C.-C.Jao, 1979 *''Oedogonium subellipsoideum'' Tiffany, 1934 *''Oedogonium subglobosum'' (Wittrock) Tiffany *''Oedogonium subglobosum'' C.E.Taft *''Oedogonium subintermedium'' Claassen *''Oedogonium sublongicolle'' C.-C.Jao, 1979 *''Oedogonium submoniliforme'' Mrozinska-Webb, 1976 *''Oedogonium suboctangulare'' West & G.S.West, 1902 *''Oedogonium suboelandicum'' J.P.Keshri, 2012 *''Oedogonium subopistostomum'' J.P.Keshri, 2012 *''Oedogonium suborbiculare'' C.-C.Jao, 1936 *''Oedogonium subplagiostomum'' S.-H.Ley, 1949 *''Oedogonium subplenum'' Tiffany *''Oedogonium subquadratum'' C.-C.Jao, 1979 *''Oedogonium subrectum'' Hirn, 1900 *''Oedogonium subrothii'' C.-C.Jao, 1979 *''Oedogonium subsetacem'' Kützing *''Oedogonium subsexangulare'' Tiffany, 1934 *''Oedogonium subspirale'' Mrozinska, 1958 *''Oedogonium subspirale'' Gauthier-Lièvre *''Oedogonium subspiralidens'' C.-C.Jao, 1979 *''Oedogonium subsuperbum'' J.P.Keshri, 2012 *''Oedogonium subtile'' Skvortzov, 1946 *''Oedogonium subtile'' H.-Z.Zhu, 1964 *''Oedogonium subulatum'' J.P.Keshri, 2012 *''Oedogonium subvaucheri'' Claassen *''Oedogonium sudanense'' Gauthier-Lièvre, 1964 *''Oedogonium suecicum'' Wittrock ex Hirn, 1900 *''Oedogonium superbum'' C.-C.Jao, 1979 *''Oedogonium supremum'' Tiffany, 1924 *''Oedogonium svirencoi'' Arnoldi & Y.V.Roll, 1939 *''Oedogonium szemaoense'' C.-C.Jao, 1979 *''Oedogonium szymanskae'' Mrozinska, 2000T
*''Oedogonium taftii'' Lacerda *''Oedogonium taftii'' Tiffany *''Oedogonium taliense'' C.-C.Jao, 1979 *''Oedogonium tapeinosporum'' Wittrock ex Hirn, 1900 *''Oedogonium taphrosporum'' Nordstedt & Hirn, 1900 *''Oedogonium taylorii'' C.-C.Jao, 1934 *''Oedogonium tenellum'' Kützing, 1845 *''Oedogonium tenerum'' C.-C.Jao, 1979 *''Oedogonium tentoriale'' Nordstedt & Hirn, 1900 *''Oedogonium tenue'' Kützing *''Oedogonium tenuissimum'' Hansgirg ex Hirn, 1900 *''Oedogonium terrestre'' Randhawa, 1939 *''Oedogonium texense'' Taft, 1946 *''Oedogonium thanaense'' Gonzalves & Jain, 1970 *''Oedogonium thermale'' P.L.Crouan & H.M.Crouan *''Oedogonium tibeticum'' Y.-X.Wei & H.J.Hu, 1984 *''Oedogonium tiffanii'' Ackley, 1929 *''Oedogonium tinghushanense'' C.-C.Jao, 1979 *''Oedogonium transeaui'' Gonzalves & Jain *''Oedogonium transversum'' Hallas ex Andersen, 1945 *''Oedogonium triandronites'' H.J.Carter *''Oedogonium trichospermum'' J.Hermann *''Oedogonium trichosporum'' J.Hermann *''Oedogonium trioicum'' Woronichin, 1923 *''Oedogonium tsingtaoense'' H.-Z.Zhu, 1964 *''Oedogonium tumidulum'' Wittrock ex Hirn, 1900 *''Oedogonium tungarense'' Gonzalves & Jain *''Oedogonium turfosum'' (Areschoug) Kützing *''Oedogonium turkestanicum'' Kiselev *''Oedogonium typhae'' C.-C.Jao, 1979 *''Oedogonium tyrolicum'' Wittrock ex Hirn, 1900U
*''Oedogonium uleanum'' Hirn, 1900 *''Oedogonium undulatum'' A.Braun ex Hirn, 1900 *''Oedogonium univerrucosum'' Obukhova *''Oedogonium upsaliense'' Wittrock ex Hirn, 1900 *''Oedogonium urbicum'' Wittrock ex Hirn, 1900 *''Oedogonium urceolatum'' Nordstedt & Hirn, 1900 *''Oedogonium utrarium'' Stephen Skinner & Entwisle, 2006V
*''Oedogonium validum'' C.-C.Jao, 1979 *''Oedogonium vanoyeanum'' Gauthier-Lièvre, 1964 *''Oedogonium variabile'' Y.V.Roll, 1945 *''Oedogonium variabile'' Hilse, 1863 *''Oedogonium variabile'' Gonzalves & Sonnad, 1962 *''Oedogonium varians'' Wittrock & Lundell ex Hirn, 1900 *''Oedogonium vaucheri'' A.Braun ex Hirn, 1900 *''Oedogonium velatum'' Hallas, 1905 *''Oedogonium vernale'' (Hassall) Wittrock *''Oedogonium verrucosum'' Hallas, 1905 *''Oedogonium vesicatum'' Wittrock ex Hirn, 1900 *''Oedogonium viaticum'' H.Szymanska & H.Werblan-Jakubiec *''Oedogonium victoriense'' G.S.West, 1906 *''Oedogonium virceburgense'' Hirn ex Hirn, 1900W
*''Oedogonium wabashense'' Tiffany, 1927 *''Oedogonium warmingianum'' Wittrock ex Hirn, 1900 *''Oedogonium welwitschii'' West & G.S.West ex Hirn, 1900 *''Oedogonium westii'' (Tiffany & Brown) Tiffany & Brown *''Oedogonium whitfordii'' Gonzalves & Jain *''Oedogonium wirceburgense'' Hirn *''Oedogonium wittrockianum'' Hirn *''Oedogonium wolleanum'' Wittrock ex Hirn, 1900 *''Oedogonium wyliei'' Tiffany, 1926Y
*''Oedogonium yunnanense'' C.-C.Jao, 1979Z
*''Oedogonium zehneri'' (Tiffany) Tiffany, 1934 *''Oedogonium zigzag'' Cleve ex Hirn, 1900 *''Oedogonium zmiewicum'' Arnoldi & Y.V.Roll, 1939 *''Oedogonium zonatum'' (Weber & Mohr) V.LeibleinReferences
{{Taxonbar, from=Q290016 Chlorophyceae genera Oedogoniales