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Cyanothamnos

Generic name: CYANOTHAMNOS Cronberg, 1991. Algolog. Stud. 64: 63-65.
Synonyms:
Diagnosis:
Type species:Cyanothamnos plancticus Cronberg 1991
Descriptions:
Komárek & Anagnostidis (1998): Colonies free-living, more or less spherical in outline, composed of a system of irregular and irregularly divaricate mucilaginous, indistinctly tube-like stalks radiating to all sides from the colonial center, containing short rows of rod-like cells, arranged more or less one after another; the appearance of a colony is like a densely branched bush with radially oriented branches. False branching of stalks arises after a displacement of divided cells from the original
direction, by the following cell division they lie in a new direction and by formation of a new sheath. Mucilaginous stalks colourless, thin, fine, sometimes diffiuent, enveloping cell rows; the slime sometimes overlaps the end cells and extends in thin threads. Cells oval to rod-shaped with rounded ends, without aerotopes.
Komárek (1992): Unicellular, colonial; colourless, free floating, in outline irregularly spherical up to 55 μm in diameter, composed from irregular and irregularly branched rows of elongated cells, radiating from the centre of a colony and irregularly, densely ramified; the appearance of the colony is like the densely branched shrub with radially oriented branches. Rows of cells are enveloped by very thin, colourless and diffluent mucilage, overlapping sometimes end cells in a form of thin mucilaginous strings; wide gelatinous envelopes are missing. Cells cylindrical, rod-like with mostly cut or slightly rounded ends, straight or slightly bent, with pale
green, not granular content, without prominent granules and aerotopes; end cells rounded or sometimes rounded-pointed. Common branching arise by a shift of a cell from the original position in the radial row of cells and by a folowing cell division in a new direction.
Genotype differences, molecular data:
Reproduction strategies, life cycles, cell division:
Komárek & Anagnostidis (1998):Cell division by binary fission, in the same plane in successive generations, perpendicular to the longitudinal axis; cells sometimes diverge from one another slightly after division and reach the original size and shape before next fission. Reproduction by disintegration of colonies. Monotypic genus.
Komárek (1992):Cell division only crosswise, perpendicularly to the long axis of a cell. Reproduction by disintegration of colonies.
Ultrastructure:
Taxonomic position, higher hierarchy:
Cyanophyceae, Chroococcales, Synechococcaceae, Synechococcoideae
Notes to taxonomy, misinterpretations:Monotypic genus
Ecology, ecophysiology, ecological significance:
Komárek (1992):The type species is freshwater, planktic, still known only from one eutrophic lake in S. Sweden (Scania).
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species
concept:
List of species:

Cyanothamnos plancticus Cronberg 1991. Archiv für Hydrobiologie/Algological Studies 64: 63
Keys:
List of stains:
Drawings:
Komárek 1992
Application technology:
Literature:

  2.1 taxonomy: Cronberg 1991, Komárek 1992, Komárek & Anagnostidis 1998
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: