Generic name: TRICHORMUS (Ralfs ex Bornet et Flahault) Komárek et Anagnostidis 1989. Algolog. Stud. 56:
303.
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| Synonyms:
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| Diagnosis:
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| Type species: Trichormus variabilis (Kützing ex Bornet et Flahault) Komárek et Anagnostidis 1989. |
Descriptions:
Komárek (1992): Solitary filaments or (mainly) periphytic mats, clusters and strata, which are composed from +/- coiled trichomes enveloped by colourless, fine or limited mucilage, without prominent sheaths; strata sometimes macroscopic. Tri- chomes uniseriate, isopolar, metameric, irregularly coiled, in later stages with several solitary, intercalar heterocytes which are usually situated in +/-regular distances in the trichome one from another, mainly clearly constricted at the cross walls, to the ends not attenuated, without any branching; end cells rounded or conical. Cells spherical, barrel-shaped or cylindrical, always without aerotopes. Heterocytes spherical, oval or cylindrical. Akinetes develop always apoheterocytic, i.e., they start to develop from vegetative cells in the middle between two heterocytes and later change all or almost all vegetative cells into akinetes, towards heterocytes.
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| Genotype differences, molecular data:
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Reproduction strategies, life cycles, cell division:
Komárek (1992): Cell division perpendicularly to the long axis of a trichome. Reproduction by hormogonia, which separate from trichomes at heterocytes, and by the germination of akinetes. Disintegration of mats.
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| Ultrastructure:
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Taxonomic position, higher hierarchy:
Cyanophyceae, Nostocales, Nostocaceae, Nostocoideae
Notes to taxonomy, misinterpretations:
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Ecology, ecophysiology, ecological significance:
Komárek (1992): Majority of species live in soil (incl. the type-species), less are periphytic in littorals of different waters (important are species from rice fields, which are intense nitrogen fixators); few species are known from marine littorals. A couple of ecologically interesting species grow endophytically in intercellular spaces of Azolla or in roots of several Cycadaceae. Many species are known only from tropics, only few are distributed in temperate or subpolar zones.
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Physiology and biochemistry:
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Distribution, endemism, problematic citations:
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Reference strain:
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Infrageneric scheme, species concept:
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List of species:
Trichormus anomalus (Fritsch) Komárek et Anagnostidis 1989
Trichormus antarcticus (Fritsch) Komárek et Anagnostidis 1989
Trichormus arvensis (Rao) Komárek et Anagnostidis 1989
Trichormus azolae (Strasburger) Komárek et Anagnostidis 1989
Trichormus botulus (Margalef) Komárek et Anagnostidis 1989
Trichormus cycadearum (Reinke) Komárek et Anagnostidis 1989
Trichormus cylindrospermoides (Subba-Raju) Komárek et Anagnostidis 1989
Trichormus desikacharyensis Vasishta 1960
Trichormus doliolum (Bharadwaya) Komárek et Anagnostidis 1989
Trichormus ellipsosporus (Fritsch) Komárek et Anagnostidis 1989
Trichormus ferilissimus (Rao) Komárek et Anagnostidis 1989
Trichormus gelatinicola (Ghose) Komárek et Anagnostidis 1989
Trichormus gunnerae (Reinke) Komárek et Anagnostidis 1989
Trichormus hallensis (Janczewski ex Bornet et Flahault) Komárek et Anagnostidis 1989
Trichormus hoshiarpurensis Vasishta 1960
Trichormus indicus Komárek 2012. Fottea 12(1): 143
Trichormus isocystoides (Welsh) Komárek et Anagnostidis 1989
Trichormus kashiensis(Bharadwaya) Komárek et Anagnostidis 1989
Trichormus khannae (Skuja) Komárek et Anagnostidis 1989
Trichormus luteus (Gardner) Komárek et Anagnostidis 1989
Trichormus minor (Laloraya et Mitra) Komárek et Anagnostidis 1989
Trichormus naviculoides (Fritsch) Komárek et Anagnostidis 1989
Trichormus parvus (Philson) Komárek et Anagnostidis 1989
Trichormus polysporus (Tarnavschi et Mitroiu) Komárek et Anagnostidis 1989
Trichormus portoricensis (Gardner) Komárek 2012. Fottea 12(1): 144
Trichormus propiquus (Setchell et Gardner) Komárek et Anagnostidis 1989
Trichormus pseudovariabilis (Voronichin) Komárek et Anagnostidis 1989
Trichormus randhawae (Venkataraman) Komárek et Anagnostidis 1989
Trichormus reverdoteanus (Popovskaya et Degtereva) Komárek et Anagnostidis 1989
Trichormus rotundosprus (Hollerbach) Komárek et Anagnostidis 1989
Trichormus shankargarhii Varma 1964
Trichormus stelloides (Canabaeus) Komárek et Anagnostidis 1989
Trichormus subtropicus (Gardner) Komárek et Anagnostidis 1989
Trichormus subvariabilis (Archibald) Komárek et Anagnostidis 1989
Trichormus tenuis (G.S. West) Komárek 2012. Fottea 12(1): 144
Trichormus thermalis (Vouk) Komárek et Anagnostidis 1989
Trichormus variabilis (Kützing ex Bornet et Flahault) Komárek et Anagnostidis 1989
Unclear taxa:
Anabaena cylindrica var. fertilissima Tiwari et Pandey 1976
Anabaena pintoi Guerrero 1950
Anabaena variabilis sensu Koster 1960
Anabaena willei Gardner 1927
Trichormus hansgirgii (Schmidle) Komárek et Anagnostidis 1989
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| Keys:
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| List of stains: |
Drawings:
 Komárek 1992 |
Application technology:
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Literature:
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2.1 taxonomy: Komárek et Anagnostidis 1987, Komárek 1992
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2.2 cytomorphology:
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2.3 16S rRNA sequencing:
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2.4 biology and life cycles:
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2.5 ecology:
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