Chlorococcales

picture info	Chlorococcales Chlorococcales is a formerly recognized Order (biology), order of green algae in the Class (biology), class Chlorophyceae. , the type family Chlorococcaceae was placed in the order Chlamydomonadales. Conventionally, many groups of coccoid green algae were lumped in the order Chlorococcales sensu lato by Komárek & Fott (1983), based on Pascher's (1918) idea of establishing orders according to life forms. However, coccoid green algae are currently placed in several orders of Chlorophyceae, Trebouxiophyceae, Ulvophyceae (e.g., ''Chlorocystis'') and Prasinophyceae within the division Chlorophyta, or in the division Charophyta (e.g., Chlorokybales, Desmidiales). Families According to Komárek & Fott (1983): * Chlorococcaceae (Chlorococcoideae, Spongiococcoideae) * Palmellaceae (Hormotiloideae, Palmelloideae, Neochloridoideae, Chlorosarcinoideae) * Chlorochytriaceae * Dicranochaetaceae * Characiaceae (Fernandinelloideae, Characioideae, Schroederioideae) * Treubariaceae * Golenki ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Hydrodictyaceae Hydrodictyaceae is a family of green algae in the order Sphaeropleales. They are found in freshwater habitats worldwide. Members of this family are either unicellular or colonial. Cells are cylindrical, polyhedral, spherical, or sometimes nearly spherical. Cells contain a single parietal, chloroplast with a pyrenoid. The cell wall may be smooth or covered in warts, ribs or other ornamentation. Reproduction can occur asexually or sexually. In asexual reproduction, the mother cell becomes a number of zoospores and swim inside the enlarged mother cell wall, until they attach to each other and become a new colony. In '' Tetraedron'', the cells do not produce zoospores but produce autospores within the enlarged mother cell wall. Sexual reproduction, when observed, occurs via isogamous gametes. Because the cell wall of some Hydrodictyaceae contain sporopollenin, they decay very slowly and thus last long in the fossil record. Genera The family Hydrodictyaceae includes the following ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Chlorophyta Chlorophyta is a division of green algae informally called chlorophytes. Description Chlorophytes are eukaryotic organisms composed of cells with a variety of coverings or walls, and usually a single green chloroplast in each cell. They are structurally diverse: most groups of chlorophytes are unicellular, such as the earliest-diverging prasinophytes, but in two major classes ( Chlorophyceae and Ulvophyceae) there is an evolutionary trend toward various types of complex colonies and even multicellularity. Chloroplasts Chlorophyte cells contain green chloroplasts surrounded by a double-membrane envelope. These contain chlorophylls '' a'' and '' b'', and the carotenoids carotin, lutein, zeaxanthin, antheraxanthin, violaxanthin, and neoxanthin, which are also present in the leaves of land plants. Some special carotenoids are present in certain groups, or are synthesized under specific environmental factors, such as siphonaxanthin, prasinoxanthin, echinenone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Chlorophyceae The Chlorophyceae, also known as chlorophycean algae, are one of the classes of green algae, within the phylum Chlorophyta. They are a large assemblage of mostly freshwater and terrestrial organisms; many members are important primary producers in the ecosystems they inhabit. Their body plans are diverse and range from single flagellated or non-flagellated cells to colonies or filaments of cells. The class Chlorophyceae has been distinguished on the basis of ultrastructural morphology; molecular traits are also being used to classify taxa within the class. Description Chlorophycean algae are eukaryotic organisms composed of cells which occur in a variety of forms. Depending on the species, Chlorophyceae can grow unicellular (e.g. ''Chlamydomonas)'', colonial (e.g. ''Volvox''), coenocytic (e.g. '' Characiosiphon''), or filamentous (e.g. '' Chaetophora''). In their vegetative state, some members have flagella while others produce them only in reproductive stages; still others never ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Chlorochytriaceae Chlorochytriaceae is a family of algae within the order Chlamydomonadales. Alternatively, it shows some morphological similarity to Characiosiphonaceae and closely related to it. It contains a number of parasitic taxa endophytic within vascular plants, mosses, or other algae. The family Chlorochytriaceae consists of microscopic organisms which are unicellular or multicellular, with relatively large cells (up to 400 µm long); the cells may have an secondarily thickened cell wall or rhizoidal extensions. Chloroplasts are usually parietally located, and may be divided into complex lobes and/or contain pyrenoids. Cells contain one or more nuclei. Reproduction occurs via zoospores with two flagella A flagellum (; : flagella) (Latin for 'whip' or 'scourge') is a hair-like appendage that protrudes from certain plant and animal sperm cells, from fungal spores ( zoospores), and from a wide range of microorganisms to provide motility. Many pr ...; sexual reproduction via gametes m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Palmellaceae The Palmellaceae are a family of green algae, specifically of the Chlamydomonadales. Members of this group are typically found in atmophytic or terrestrial habitats, or as phycobionts associated with lichens; a few are found in fresh water. Members of the Palmellaceae consist of cells which may be solitary or colonial, when colonial in irregular groups or gelatinous colonies. Cells are usually spherical, more rarely ellipsoidal, ovoid, or bean-shaped. The chloroplast is variable in morphology, either parietally or centrally placed. Parietal chloroplasts may be cup-shaped or divided into smaller plates, while central chloroplasts may be dissected with radiating lobes or forming an irregular net-like mesh. Pyrenoids may be present or absent. The nucleus is mostly central. Reproduction occurs via the formation of zoospores of morphology similar to those of the genus ''Dunaliella'', which lack a true cell wall. More rarely, aplanospore {{Short pages monitor [Baidu]
	Characiaceae Characiaceae is a family of green algae in the order Sphaeropleales. It contains epiphytic or planktonic algae that are unicellular or colonial. The cells are heteropolar, with basal and apical ends having different shapes. The daughter cells are often retained in the cell wall of the old mother cell, whose cell wall becomes gelatinized. Taxonomy The taxonomy of Characiaceae has undergone significant revision in the last century. Characiaceae once included genera such as '' Schroederia'', but that circumscription made the family polyphyletic, so many of those genera have been transferred to other families. However, the taxonomic affiliation of the type species of the genus ''Characium'' (''C. sieboldii'') is still unclear, which necessitates further revision of the family. , AlgaeBase AlgaeBase is a global species database of information on all groups of algae, both seaweed, marine and freshwater algae, freshwater, as well as sea-grass. History AlgaeBase began in March 1996, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Dicranochaetaceae ''Dicranochaete'' is a genus of green algae in the order Chaetopeltidales. It is the only genus in the family Dicranochaetaceae. It is a rare genus, found as an epiphyte on aquatic plants and algae in freshwater habitats. One species is terrestrial, having been described from the soil of a spruce forest. ''Dicranochaete'' consists of single cells or a few cells clustered together, attached to a substrate. Cells are hemispherical or ellipsoidal in side view. The apical portion of the cells are covered by a hood-like structure, which may be spiny, and has one or more bristles, also termed setae. The seta is hollow and dichotomously branched. Each cell has a cup-shaped, parietal chloroplast with or without pyrenoids. Usually two contractile vacuoles are present in the basal part of the cell. Asexual reproduction occurs by the formation of biflagellate zoospores; sexual reproduction is by biflagellate gametes, which fuse to form a quadriflagellate zygote. Species are distinguished ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]