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Iyengariella

Generic name: IYENGARIELLA Desikachary 1953. Phytomorph. 3(3): 252.
Synonyms:
Diagnosis:
Type species: Iyengariella tirupatiensis Desikachary 1953
Descriptions:
Komárek (1992): Filamentous - thallous; thallus attached in tufts, composed from basal, pseudo- dichotomously branched, coiled and more or less prostrate filaments and upper unbranched, free, erect filaments arising from lower trichomes after true branching. Trichomes uniserial, composed from cylindrical cells in young and apical trichome parts and from barrel-shaped cells in older trichomes; trichomes are true branched (typical reverse V-type, less frequently lateral T-type); young trichomes and branches
are continually:attenuated to the ends, forming cellular, cylindrical, narrow and long hairs with elongated cells. Sheaths present, wide, co1ourless, enclosing one or more trichomes, in lower parts lamellated, divergent. Cells shorter than wide in lower trichomes and up to ten times longer than wide in hairs. Heterocytes absent, akinetes arise in short rows at old parts of trichomes, subspherical, a little larger than vegetative cells, with thickened, dark cell wall.
Genotype differences, molecular data:
Reproduction strategies, life cycles, cell division:
Komárek (1992): Cells divide crosswise, particularly
in indistrict, short, meristematic zones. Reproduction by hormogonia, which
separate from trichomes by help of necridic cells.
Ultrastructure:
Taxonomic position, higher hierarchy:
Cyanophyceae,Nostocales, Symphyonemataceae
Notes to taxonomy, misinterpretations:
Ecology, ecophysiology, ecological significance:
Komárek (1992): The type species lives submersely and epilithic in streaming water, known only from mountain creeks in India.
Physiology and biochemistry:
Distribution, endemism, problematic
citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:

Iyengariella endolithica Seeler et Golubić 1991. Archiv für Hydrobiologie/Algological Studies 64: 403
Iyengariella tirupatiensis Desikachary 1953
Keys:
List of stains:
Drawings:
Komárek 1992
Application technology:
Literature:

  2.1 taxonomy: Desikachary 1953, Desikachary 1959, Komárek 1992
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: