Blennothrix
| Generic name: BLENNOTHRIX Kützing ex Anagnostidis et Komárek, 1988. Algolog. Stud. 50-53: 429. | ||||||||||
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| Type species: Blennothrix vermicularis Kützing ex Anagnostidis et Komárek 1988. | ||||||||||
| Descriptions: Komárek (1992): Filamentous - thallic; filaments solitary, in fascicle-like colonies or in mats (microscopic up to macroscopic), composed from (1)2 to several trichomes closed within the firm or more or less mucilaginous, usually slightly widened, colourless, sometimes slightly lengthwise (and rarely also crosswise) lamellated, or outer diffluent sheaths, open at the apex; the filaments are isopolar or more or less polarized (not trichomes!), sometimes specifically branched, but without typical tolypotrichoid or scytonematoid false branching (sheaths are branched only, never trichomes). Trichomes 8-30μm wide, long, uniserial, more or less flexuous or waved, isopolar, composed from shortly cy1lndrical cells, slightly constricted or unconstricted at the cross walls, not attenuated towards ends. Cells always several times shorter than wide (discoid), without aerotopes, usually with fine granulation; end cells widely rounded, sometimes with a narrow calyptra. Heterocytes and akinetes absent. |
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| Genotype differences, molecular data: | ||||||||||
| Reproduction strategies, life cycles, cell division: Komárek (19892): Cell division crosswise, perpendicularly to the long trichome axis, in a rapid sequence. Reproduction by differently long, usually short, motile hormogonia, which separate from the trichome by help of necridic cells and liberate later from sheaths; separation of hormogonia, which remain within sheaths, causes the development of polytrichal filaments and a special type of false branching. The whole trichome sometimes disintegrates into hormogonia up to solitary cells. |
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| Ultrastructure: | ||||||||||
| Taxonomic position, higher hierarchy: Cyanophyceae, Oscillatoriales, Oscillatoriaceae Notes to taxonomy, misinterpretations: |
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| Ecology, ecophysiology, ecological significance: Komárek (1989): Only in aquatic biotopes. Five species are known from the marine littor,al or from salinic swamps, growing mainly periphytic on macroscopic algae or among organic detritus. Eight species grow in clear and usually cold springs and creeks (rarely also in stagnant waters) in mountains, mainly on mosses or submerse plants, rarely on stony substrates (usually in temperate zones in geographically distant localities); one species was described from a mountain creek in Portorico, few species are known only from central and SE-Asiatic high mountain regions, one species is known from streaming waters in Antarctica. |
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| Physiology and biochemistry: |
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| Infrageneric scheme, species concept: |
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List of species:
Blennothrix boergesenii (Gardner) Anagnostidis 2001
Unclear taxa: |
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Drawings: Komárek(1992) |
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Literature:
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