Dzensia

Generic name: DZENSIA Voronichin, 1929. Izv. Glavn. Bot. Sada SSSR 28: 158.
Synonyms:
Diagnosis:
Type species: Dzensia salina Voronichin 1929
Descriptions:
Komárek & Anagnostidis 1998: Colonies mucilaginous, microscopic to macroscopic, more or less spherical, oval or ovoid, sometimes formed from hemispherical subcolonies, up to 1 cm in diameter, with distinct and delimited, firm pellicular surface. Cells almost spherical or oval up to long cylindrical, without their own gelatinous envelopes, in young colonies irregularly distributed, later in more or less regular, parallel and radially oriented rows, surrounded by scarcely visible (staming !) tube-like gelatinous sheaths.
Komárek (1992): Unicellular - colonial; colonies spherical or oval, later irregular, macroscopic, up to 1 cm in diameter (later more), sometimes composed from subcolonies, limited by firm mucilaginous layer ("periderm"); daughter colonies connected sometimes with the original mother colony by gelatinous, hyaline, wide strings, which later disappear. Cells spherical up to oval or shortly rod-like, particularly before division elongated or up to several times longer than wide (involution forms ?), within colony disposed in radial rows and sometimes in gelatinous tubes, which are, however, situated irregularly inside of colony.
Genotype differences, molecular
data:
Reproduction strategies, life cycles, cell division:
Komárek & Anagnostidis 1998: Cell division (according to Voronichin's orig. fig:) by binary fission (pinching), in one direction in successive generations, perpendicular to the longer axis (origin of radial rows); reproduction by disintegration of colonies.
Komárek (1992): Cell division-by pinching, only in one plane, perpendicular to the longer axes of cells. Reproduction by liberating small daughter colonies or by gelatinous clusters containing several cells.
Ultrastructure:
Taxonomic position, higher hierarchy:
Cyanophyceae, Chroococcales, Synechococcaceae, Synechococcoideae
Notes to taxonomy, misinterpretations:Monotypic genus. The generic features are not clear, all characters resemble the genus Aphanothece.
Ecology, ecophysiology, ecological significance:
Komárek (1992): The up to now single species was described from a hypersalinic inland lake in central USSR (southern Siberia).
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:
Dzensia salina
Voronichin 1929

Unclear taxa:
Entophysalis weningeri Bourrelly 1984

Keys:
List of stains:
Drawings:
Komárek 1992
Application technology:
Literature:
  2.1 taxonomy: Voronichin 1929, Hof & Fremy 1933, Elenkin 1938, Geitler 1942,Hollerbach & al. 1953, Hollerbach & al. 1955, Bourrelly  1970, Bourrelly 1985, Komárek & Anagnostidis 1986, Komárek 1992, Komárek & Anagnostidis 1998
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: