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Verrucaria Oulankaensis
''Verrucaria oulankaensis'' is a rare species of saxicolous (rock-dwelling) crustose lichen in the family Verrucariaceae. It is found in north-eastern Finland, where it occurs on calcareous rocks on river shores. Taxonomy The lichen was formally described as a new species in 2017 by Juha Pykälä and Leena Myllys. The type specimen was collected by the first author along the shore of the Oulankajoki river in Oulanka National Park (Koillismaa); there, at an altitude of , it was found growing on a dolomite rock outcrop jutting out from a southwest-facing rock wall. The species epithet ''oulankaensis'' refers to the predominance of collections from the Oulanka area, which the authors call "one of the lichenologically most important areas in Finland". The type specimen is kept in the collections of the mycological herbaria of the Botanical Museum of the Finnish Museum of Natural History. Description The colour of the crust-like thallus ''Verrucaria oulankaensis'' ranges from p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saxicolous Lichen
A saxicolous lichen is a lichen that grows on rock. The prefix "sax" from the Latin means "rock" or "stone". Characteristics Saxicolous lichens exhibit very slow growth rates. They may develop on rock substrates for long periods of time, given the absence of external disturbances. The importance of the mineral composition of the rock substrate, as well as the elemental geochemistry Geochemistry is the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth's crust and its oceans. The realm of geochemistry extends beyond the Earth, encompassing the e ... is also important to the distribution of saxicolous lichens, but the relationship between the substrate influence on lichens, either chemical or textural, is still obscure. Communities of saxicolous lichens are often species-rich in terms of number. References Lichenology {{lichen-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prothallus
A prothallus, or prothallium, (from Latin ''pro'' = forwards and Greek ''θαλλος'' (''thallos'') = twig) is usually the gametophyte stage in the life of a fern or other pteridophyte. Occasionally the term is also used to describe the young gametophyte of a liverwort or peat moss as well. In lichens it refers to the region of the thallus that is free of algae. The prothallus develops from a germinating spore. It is a short-lived and inconspicuous heart-shaped structure typically 2–5 millimeters wide, with a number of rhizoids (root-like hairs) growing underneath, and the sex organs: archegonium (female) and antheridium (male). Appearance varies quite a lot between species. Some are green and conduct photosynthesis while others are colorless and nourish themselves underground as saprotrophs. Alternation of generations Spore-bearing plants, like all plants, go through a life-cycle of alternation of generations. The fully grown sporophyte, what is commonly referred to as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lichen Species
A lichen ( , ) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship.Introduction to Lichens – An Alliance between Kingdoms . University of California Museum of Paleontology. Lichens have properties different from those of their component organisms. They come in many colors, sizes, and forms and are sometimes plant-like, but are not s. They may have tiny, leafless branches (); flat leaf-like structures ( |
Verrucaria
''Verrucaria'' is a genus of lichenized (lichen-forming) fungi in the family Verrucariaceae. Taxonomy The genus was circumscribed by German botanist Heinrich Adolph Schrader in 1794, with '' Verrucaria rupestris'' assigned as the type species. In his brief diagnosis of the genus, Schrader mentioned the more or less spherical (''subglobose''), closed ascomata, and the crustose thallus. The genus name is derived from the Latin word ''verruca'' (meaning "wart") and the suffix ''-aria'' (meaning "belonging to" or "possession"). Ecology As of 2015, there were 16 ''Verrucaria'' species classified as marine species: '' V. adguttata'', '' V. allantoidea'', '' V. ceuthocarpa'', '' V. corallensi'', '' V. ditmarsica'', '' V. erichsenii'', '' V. halizoa'', '' V. halochlora'', '' V. microsporoides'', '' V. paulula'', '' V. psychrophila'', '' V. sandstedei'', '' V. serpuloides'', '' V. sessilis'', '' V. subdiscreta'', ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Verrucaria Species
'' Verrucaria'' is a large genus of lichens in the family Verrucariaceae. , ''Species Fungorum'' (in the Catalog of Life) accepts 149 species in the genus. Historically, many more taxa than this have been placed in genus ''Verrucaria'' at some time in their taxonomic history. For example, the nomenclatural authority Index Fungorum has 4127 taxa with the genus name ''Verrucaria'', including species, varieties, and forms. A *'' Verrucaria acrotella'' *'' Verrucaria adguttata'' *'' Verrucaria aethiobola'' *'' Verrucaria aethioboliza'' *'' Verrucaria ahlesiana'' *'' Verrucaria ahtii'' – Finland, Lithuania, Russia, Switzerland *'' Verrucaria alborimosa'' – Australia *'' Verrucaria allantoidea'' – Japan *'' Verrucaria alpigena'' *'' Verrucaria andesiatica'' *'' Verrucaria antepotens'' – Nepal *'' Verrucaria anziana'' *'' Verrucaria aquatilis'' *'' Verrucaria aranensis'' *'' Verrucaria aspecta'' *'' Verrucaria aucklandica'' *'' Verrucaria australiensis'' – ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peltigera Retifoveata
''Peltigera retifoveata'' is a species of foliose lichen in the family Peltigeraceae. It is found in Scandinavia, western Eurasia and western North America, where it grows on the ground and amongst mosses. Taxonomy Because of its thallus surface texure, ''Peltigera retifoveata'' is a member of the species complex centred around '' Peltigera canina''. It was formally described as a new species in 1985 by the Finnish lichenologist Orvo Vitikainen. The type specimen was collected by Vitikainen from Juuma (Kuusamo, Finland) at an elevation of , where it was found growing on the ground among mosses. One vernacular name used in North America is "sponge pelt". Description The thallus of ''P. retifoveata'' grows up to about in diameter, comprising individual that are about long and wide. The thallus surface is thickly tomentose near the margins, but becomes smoother ( near the centre. The thallus underside features thick, pale, tomentose veins, with white and pit-like i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nephroma Helveticum
''Nephroma'' is a genus of medium to large foliose lichens. The genus has a widespread distribution. They are sometimes called kidney lichens, named after the characteristic kidney-shaped apothecia that they produce on the lower surface of their lobe tips, which often curl upwards and thus are visible from above. Sterile specimens that do not have apothecia can look somewhat like ''Melanelia'', ''Peltigera'', '' Platismatia'', or '' Asahinea''. Most species grow either on mossy ground or rocks, or on trees. All species of ''Nephroma'' contain cyanobacteria (in the genus ''Nostoc'') as a photobiont, which allows the organism to fix nitrogen. In some species the cyanobacteria is the sole photobiont, while other species also contain a green alga photobiont (''Coccomyxa'') and the cyanobacteria is restricted to warty cephalodia on the upper or lower surface of the lichen. Description Species of ''Nephroma'' have a stratified foliose thallus with a cortex that is well-developed on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Staurothele Areolata
''Staurothele areolata'' is blackish-brown crustose lichen in the family Verrucariaceae. It is found in western North America. Habitat and range It is found in mountains of western North America up to , and in Sonoran Desert in Mexico and in Arizona, where it is common. In Southern California, it is less common, and is found on outcrops of limestone, gneiss, schist, and sandstone. It is found on acid or basic rocks, near water. It is found in the mountains of the United States Sierra Nevada range.Lichens in relation to management issues in the Sierra Nevada national parks, McCune, B., J. Grenon, and E. Martin, L. Mutch, Sierra Nevada Network, Cooperative agreement CA9088A0008. Oregon State University, Corvallis, Oregon, and Sequoia and Kings Canyon National Parks, Three Rivers, California/ref> Description The thallus is crustose with deeply cracked areoles In botany, areoles are small light- to dark-colored bumps on cactus, cacti out of which grow clusters of Thorns, spines ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ascospore
An ascus (; ) is the sexual spore-bearing cell produced in ascomycete fungi. Each ascus usually contains eight ascospores (or octad), produced by meiosis followed, in most species, by a mitotic cell division. However, asci in some genera or species can occur in numbers of one (e.g. ''Monosporascus cannonballus''), two, four, or multiples of four. In a few cases, the ascospores can bud off conidia that may fill the asci (e.g. ''Tympanis'') with hundreds of conidia, or the ascospores may fragment, e.g. some ''Cordyceps'', also filling the asci with smaller cells. Ascospores are nonmotile, usually single celled, but not infrequently may be coenocytic (lacking a septum), and in some cases coenocytic in multiple planes. Mitotic divisions within the developing spores populate each resulting cell in septate ascospores with nuclei. The term ocular chamber, or oculus, refers to the epiplasm (the portion of cytoplasm not used in ascospore formation) that is surrounded by the "bourrelet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Micrometre
The micrometre ( international spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is a unit of length in the International System of Units (SI) equalling (SI standard prefix "micro-" = ); that is, one millionth of a metre (or one thousandth of a millimetre, , or about ). The nearest smaller common SI unit is the nanometre, equivalent to one thousandth of a micrometre, one millionth of a millimetre or one billionth of a metre (). The micrometre is a common unit of measurement for wavelengths of infrared radiation as well as sizes of biological cells and bacteria, and for grading wool by the diameter of the fibres. The width of a single human hair ranges from approximately 20 to . The longest human chromosome, chromosome 1, is approximately in length. Examples Between 1 μm and 10 μm: * 1–10 μm – length of a typical bacterium * 3–8 μm – width of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ascus
An ascus (; ) is the sexual spore-bearing cell produced in ascomycete fungi. Each ascus usually contains eight ascospores (or octad), produced by meiosis followed, in most species, by a mitotic cell division. However, asci in some genera or species can occur in numbers of one (e.g. ''Monosporascus cannonballus''), two, four, or multiples of four. In a few cases, the ascospores can bud off conidia that may fill the asci (e.g. ''Tympanis'') with hundreds of conidia, or the ascospores may fragment, e.g. some ''Cordyceps'', also filling the asci with smaller cells. Ascospores are nonmotile, usually single celled, but not infrequently may be coenocytic (lacking a septum), and in some cases coenocytic in multiple planes. Mitotic divisions within the developing spores populate each resulting cell in septate ascospores with nuclei. The term ocular chamber, or oculus, refers to the epiplasm (the portion of cytoplasm not used in ascospore formation) that is surrounded by the "bourrelet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alga
Algae (; singular alga ) is an informal term for a large and diverse group of photosynthetic eukaryotic organisms. It is a polyphyletic grouping that includes species from multiple distinct clades. Included organisms range from unicellular microalgae, such as ''Chlorella,'' ''Prototheca'' and the diatoms, to multicellular forms, such as the giant kelp, a large brown alga which may grow up to in length. Most are aquatic and autotrophic (they generate food internally) and lack many of the distinct cell and tissue types, such as stomata, xylem and phloem that are found in land plants. The largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the ''Charophyta'', a division of green algae which includes, for example, ''Spirogyra'' and stoneworts. No definition of algae is generally accepted. One definition is that algae "have chlorophyll ''a'' as their primary photosynthetic pigment and lack a sterile covering of cells around t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
