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Hormothamnion

Generic name: HORMOTHAMNION Grunow ex Bornet et Flahault, 1888. Ann. Sci. Nat. Bot., ser. 7, 7: 259.
Synonyms: ANABAENOTHRIX Randhawa, 1936. Proc. Ind. Acad. Sci. 3(B): 407.[HORMOTHAMNION Grunow, Reise seiner Majestat Fregate Novara um die Erde; botanischer Theil, Bd I, Algen, p. 31, 1867 ex Bornet et Flahault, 1886: Sphaerozyga sp.
Diagnosis:
Bornet et Flahault (1888): Thallus e filis longitudinaliter concretis formatus, nunc in stratum expansus, nunc filiformis erectus, laciniato-ramosus, membrana communi nulla circumdatus. Vaginae membranacea tenues, saepe muco involutae et confluentes, hyalinae. Trichomata moniliformia. Heterocystae intercalares. Sporae nondum visae.
Type species: Hormothamnion enteromorphoides Grunow ex Bornet et Flahault 1888. - Very little
known
two species; revision on the both specific and generic levels are
needed
(comp. Hydrocoryne, Trichormus, Anabaena, Aulosira).
Descriptions:
Komárek (1992): Filamentous - thallous; filaments composed from one to more parallely arranged trichomes enveloped by limited, thin or thick, firm or gelatinous sheaths, single or many together, joined more or less in a mucilaginous mat or forming fasciculate or clustering colonies. Trichomes simple, not branched, not attenuated to the ends, of the same width along the whole length, uniserial, moniliform, clearly constricted at cross walls, probably isopolar and metameric. Sheaths colourless,
structureless. Cells subspherical or barrel-shaped, not elongated to the ends. Heterocytes interca1ar, probably only single, several in a trichome. Akinetes not known.
Genotype differences, molecular data:
Reproduction strategies, life cycles, cell division:
Komárek (1992): Reproduction was not described. Cells divide evidently cross-wise along the whole trichome, reproduction probably by hormogonia.
Ultrastructure:
Taxonomic position, higher hierarchy:Cyanophyceae,
Nostocales, Nostocaceae, Anabaenoideae
Notes to taxonomy, misinterpretations:
Ecology, ecophysiology, ecological significance:
Komárek (1992): Both species are marine, growing on the muddy bottom of sea beaches or among marine algae. One species was described from Pacific islands, the second,one (type species) was recorded from Caribbean district, Canary Islands and from Mauritius.
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:
Hormothamnion enteromorphoides Grunow Bornet et Flahault, 1888. Ann. Sci. Nat. Bot., ser. VII, 7: 260
Hormothamnion solutum  Bornet et Grunow ex Bornet et Flahault, 1888. Ann. Sci. Nat. Bot., ser. VII, 7: 259
Keys:
List of stains:
Drawings:
Komárek
1992
Application technology:
Literature:

  2.1 taxonomy: Bornet et Flahault 1886, Geitler 1932, Geitler 1942, Komárek 1992
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: