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Herpyzonema

Generic name: HERPYZONEMA Weber van Bosse, 1913. Siboga Exped., p. 36.
Synonyms:
Diagnosis:
Type species: Herpyzonema intermedium Weber van Bosse 1913
Descriptions:
Komárek (1992): Filamentous - thallous; thallus (mats) composed from clusters of irregularly coiled, true-branched filaments; trichomes uniserial, morphologically not diversified in main trichomes and branches, constricted at cross-walls, with typical reverse Y-branchings, more or less cylindrical, not attenuated to the ends, with rounded end cells, enveloped by thick sheaths. Sheaths firm, widened, lamelated, yellow-brown, sometimes with hyaline outer layers. Cells cylindrical or barrel-shaped. Heterocytes intercalar, elongated, cylindrical or barrel-shaped. Akinetes not known.
Genotype differences, molecular data:
Reproduction strategies, lifecycles, cell division:
Komárek (1992): Cells divide cross-wise in trichomes,
in old parts sometimes successively in more planes into numerous nanocytes,
liberating from enveloping sheath. Hormogonia formation not observed
Ultrastructure:
Taxonomic position, higher hierarchy:
Cyanophyceae, Stigonematales, Symphyonemataceae
Notes to taxonomy, misinterpretations:
Ecology, ecophysiology, ecological significance:
Komárek (1992): Both species are aerophytic, known from limestone rocks in Indonesia (species) and Papua-New Guinea.
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:

List of species:

Herpyzonema intermedium Weber van Bosse 1913
Herpyzonema pulverulentum Hernández-Mariné et Canals 1994

Unclear taxa:
Herpyzonema lorentzii Weber van Bosse 1913
Herpyzonema rupicola Weber van Bosse 1913

Keys:
List of stains:
Drawings:
Komárek 1992
Application technology:
Literature:

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