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Handeliella

Generic name: HANDELIELLA Skuja in Handel-Mazzetti, 1937. Symb. Sinicae 1: 30.
Synonyms:
Diagnosis:
Type species: Handeliella stockmayeri Skuja 1937. - Monotypic genus.
Descriptions:
Komárek (1992): Filamentous - thallous; thallus crusty, flat, 2-3~layered, widely spread on the substrate, with usually erected, parallely and densely arranged or slightly tangled filaments, confluent laterally by their sheaths. Trichomes uniserial, rarely with two cells aside, with constrictions at cross-walls, cylindrical or slightly narrowed in the basal and widened near the apical part; in the upper parts with numerous false branchings, in the lower ones with true branchings of the T-type; branches arising from false ramification are usually short, perpendicular to the original trichome, changing often into hormocysts. The lower parts of thallus with destroyed, dying trichomes. The true branches grow initially perpendicularly to the mother trichome, later curve to the direction of the original trichome. Sheaths around old trichomes usually colourless, homogeneous and thin, diffluent and confluent at the margin, in the younger (upper) part of thallus lamellated, funnel-like striated, with yellow- brown inner layers. Cells barrel-shaped. Heterocytes intercalar or basal (after false branching), solitary. Akinetes not known.
Genotype differences, molecular data:
Reproduction strategies, life cycles, cell division:
Komárek (1992): Cells divide cross-wise, particularly
in subapical meristematic zones. Reproduction by hormocysts or by fragmentation
of filaments.
Ultrastructure:
Taxonomic position, higher hierarchy:
Cyanophyceae, Stigonematales, Borzinemataceae
Notes to taxonomy, misinterpretations:
Ecology, ecophysiology, ecological significance:
Komárek (1992): Aerophytic, known only from dry walls in China (Yunnan).
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:
Handeliella stockmayeri Skuja 1937
Keys:
List of stains:
Drawings:
Komárek (1992)
Application technology:
Literature:

  2.1 taxonomy: Skuja 1937, Geitler 1942, Bourrelly 1970, Komárek 1992
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: