|
Blennothallia
''Blennothallia'' is a genus of jelly lichens in the family Collemataceae. It has four species, which collectively have a cosmopolitan distribution. Taxonomy The genus was circumscribed in 1853 by Italian botanist Vittore Trevisan de Saint-Léon. Although Trevisan did not select a type species for the genus, ''Lichen crispus'' was selected as lectotype in 2013. The genus corresponds to the ''Colema crispum'' species group recognized in 1954 by Gunnar Degelius. Molecular phylogenetic analysis shows that ''Blennothallia'' forms a well-supported lineage together with ''Scytinium'' and '' Lethagrium'' in the family Collemataceae. Description ''Blennothallia'' species have a dark olive-green to black thallus that typically measures in diameter, comprising rounded lobes that are wide. The thallus lacks a cortex, and the medulla is paraplectenchymatous (fungal tissue with a cellular structure superficially like the parenchyma of vascular plants). The photobiont partner is a member o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blennothallia Crispa
''Blennothallia'' is a genus of jelly lichens in the family Collemataceae. It has four species, which collectively have a cosmopolitan distribution. Taxonomy The genus was circumscribed in 1853 by Italian botanist Vittore Trevisan de Saint-Léon. Although Trevisan did not select a type species for the genus, ''Lichen crispus'' was selected as lectotype in 2013. The genus corresponds to the ''Colema crispum'' species group recognized in 1954 by Gunnar Degelius. Molecular phylogenetic analysis shows that ''Blennothallia'' forms a well-supported lineage together with ''Scytinium'' and '' Lethagrium'' in the family Collemataceae. Description ''Blennothallia'' species have a dark olive-green to black thallus that typically measures in diameter, comprising rounded lobes that are wide. The thallus lacks a cortex, and the medulla is paraplectenchymatous (fungal tissue with a cellular structure superficially like the parenchyma of vascular plants). The photobiont partner is a member o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blennothallia Furfureola
''Blennothallia'' is a genus of jelly lichens in the family Collemataceae. It has four species, which collectively have a cosmopolitan distribution. Taxonomy The genus was circumscribed in 1853 by Italian botanist Vittore Trevisan de Saint-Léon. Although Trevisan did not select a type species for the genus, ''Lichen crispus'' was selected as lectotype in 2013. The genus corresponds to the ''Colema crispum'' species group recognized in 1954 by Gunnar Degelius. Molecular phylogenetic analysis shows that ''Blennothallia'' forms a well-supported lineage together with ''Scytinium'' and '' Lethagrium'' in the family Collemataceae. Description ''Blennothallia'' species have a dark olive-green to black thallus that typically measures in diameter, comprising rounded lobes that are wide. The thallus lacks a cortex, and the medulla is paraplectenchymatous (fungal tissue with a cellular structure superficially like the parenchyma of vascular plants). The photobiont partner is a member o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blennothallia Novozelandica
''Blennothallia'' is a genus of jelly lichens in the family Collemataceae. It has four species, which collectively have a cosmopolitan distribution. Taxonomy The genus was circumscribed in 1853 by Italian botanist Vittore Trevisan de Saint-Léon. Although Trevisan did not select a type species for the genus, ''Lichen crispus'' was selected as lectotype in 2013. The genus corresponds to the ''Colema crispum'' species group recognized in 1954 by Gunnar Degelius. Molecular phylogenetic analysis shows that ''Blennothallia'' forms a well-supported lineage together with ''Scytinium'' and '' Lethagrium'' in the family Collemataceae. Description ''Blennothallia'' species have a dark olive-green to black thallus that typically measures in diameter, comprising rounded lobes that are wide. The thallus lacks a cortex, and the medulla is paraplectenchymatous (fungal tissue with a cellular structure superficially like the parenchyma of vascular plants). The photobiont partner is a member o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blennothallia Fecunda
''Blennothallia'' is a genus of jelly lichens in the family Collemataceae. It has four species, which collectively have a cosmopolitan distribution. Taxonomy The genus was circumscribed in 1853 by Italian botanist Vittore Trevisan de Saint-Léon. Although Trevisan did not select a type species for the genus, ''Lichen crispus'' was selected as lectotype in 2013. The genus corresponds to the ''Colema crispum'' species group recognized in 1954 by Gunnar Degelius. Molecular phylogenetic analysis shows that ''Blennothallia'' forms a well-supported lineage together with ''Scytinium'' and '' Lethagrium'' in the family Collemataceae. Description ''Blennothallia'' species have a dark olive-green to black thallus that typically measures in diameter, comprising rounded lobes that are wide. The thallus lacks a cortex, and the medulla is paraplectenchymatous (fungal tissue with a cellular structure superficially like the parenchyma of vascular plants). The photobiont partner is a member o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Collemataceae
The Collemataceae are a lichenized family of fungi in the order Peltigerales. The family contains ten genera and about 325 species. The family has a widespread distribution. Taxonomy The family was circumscribed by Jonathan Carl Zenker in 1827; ''Collema'' is the type genus. Description Collemataceae members have a thallus that is either foliose, crustose, squamulose or minutely shrubby. The thallus is gelatinous, sometimes swelling when wet, with a colour ranging from dark olive-green to brown-black, reddish brown or rarely grey-blue. The upper and lower cortex is either absent or composed of angular brick-like cells, more rarely of flattened compressed cells. The medulla contains loosely interwoven narrow hyphae or is compact with broad-short-celled hyphae; these hyphae are intermixed with the photobiont. The texture of the upper cortex surface ranges from smooth to wrinkled or ridged, and is often glossy, but rarely arachnoid. The underside of the cortex is smooth, arachnoid o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terricolous Lichen
A terricolous lichen is a lichen that grows on the soil as a substrate. An example is some members of the genus ''Peltigera ''Peltigera'' is a genus of approximately 100 species of foliose lichens in the family Peltigeraceae. Commonly known as the dog or pelt lichens, species of ''Peltigera'' are often terricolous (growing on soil), but can also occur on moss, trees, ...''. References Lichenology {{lichen-stub ... [...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] |
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] |
Nostoc
''Nostoc'', also known as star jelly, troll’s butter, spit of moon, fallen star, witch's butter (not to be confused with the fungi commonly known as witches' butter), and witch’s jelly, is the most common genus of cyanobacteria found in various environments that may form colonies composed of filaments of moniliform cells in a gelatinous sheath of polysaccharides. ''Nostoc'' is a genus of photosynthetic, Gram-negative cyanobacteria that can be found in both terrestrial and aquatic environments. It may also grow symbiotically within the tissues of plants, providing nitrogen to its host through the action of terminally differentiated cells known as heterocysts. ''Nostoc'' is a genus that includes many species that are diverse in morphology, habitat distribution, and ecological function. ''Nostoc'' can be found in soil, on moist rocks, at the bottom of lakes and springs, and rarely in marine habitats. It may also be found in terrestrial temperate, desert, tropical, or polar env ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyanobacteria
Cyanobacteria (), also known as Cyanophyta, are a phylum of gram-negative bacteria that obtain energy via photosynthesis. The name ''cyanobacteria'' refers to their color (), which similarly forms the basis of cyanobacteria's common name, blue-green algae, although they are not usually scientifically classified as algae. They appear to have originated in a freshwater or terrestrial environment. Sericytochromatia, the proposed name of the paraphyletic and most basal group, is the ancestor of both the non-photosynthetic group Melainabacteria and the photosynthetic cyanobacteria, also called Oxyphotobacteria. Cyanobacteria use photosynthetic pigments, such as carotenoids, phycobilins, and various forms of chlorophyll, which absorb energy from light. Unlike heterotrophic prokaryotes, cyanobacteria have internal membranes. These are flattened sacs called thylakoids where photosynthesis is performed. Phototrophic eukaryotes such as green plants perform photosynthesis in plast ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
_Figure_2.jpg "Click for more on -> Nostoc")
