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Tubiella

Generic name: TUBIELLA Hollerbach, 1935. Acta Inst. Bot. Acad. Sci. SSSR, ser. 2, 2: 34.
Synonyms:
Diagnosis:
Type species: Tubiella elenkinii Hollerbach 1934. - Monospecific genus.
Descriptions:
Komárek & Anagnostidis (1998): Colonies in the form of an amorphous, gelatinous mass, spreading over the substrate, composed of more or less cylindrical tubes, densely and more or less parallely arranged, sometimes wider in some sections than others, unbranched; sheaths fine and scarcely visible or with distinct margin, rounded or truncate at the ends, later open. Within the sheaths a uniseriate row (rarely 2-3 rows) of usually “zig-zag” disposed cells, rarely in straight, wavy or screw-shaped formations. Cells elongate, oval to cylindrical, enveloped by very fine, colourless, scarcely visible gelatinous envelopes (staining !), slightly distant from or touching one another.
Komárek (1992): Unicellular - pseudofilamentous - colonial; colonies widely spread in a thin layer on the substrate,_gelatinous, blue-green, composed from densely, more or less parallel oriented sheath-like tubes, in which are the cells in one row or (later) in zig-zag or slightly screw-like coiled rows, rarely organized irregularly. Sheaths simple, sometimes slightly widened, colourless, sharply limited or diffluent, not layered, at the ends roundly closed, or (after escaping, of solitary cells) opened and cut, (3.3)4 - 6.7 (8.3) um wide. Cells elongated, ellipsoid, oval or cylindrical with rounded ends, with solitary large granules within plasma, touching one to
another by their ends.
Genotype differences, molecular data:
Reproduction strategies, life cycles, cell division:
Komárek & Anagnostidis (1998): Cell division transverse, in the same plane in successive generations, perpendicular to the longitudinal axis; reproduction by solitary cells liberated from gelatinous tubes. Monospecific genus.
Komárek (1992): Division only in one plane perpendicular
to the long axis of cells. Reproduction by solitary cells escaping from the
open sheaths at their apexes.
Ultrastructure:
Taxonomic position, higher hierarchy:
Cyanophyceae, Chroococcales, Synechococcaceae, Synechococcoideae
Notes to taxonomy, misinterpretations:
Ecology, ecophysiology, ecological significance:
Komárek (1992): Soil species (type-species) known up to now only from the vicinity of St. Peterburg (USSR).

Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:
Tubiella elenkinii Hollerbach 1935
Keys:
List of stains:
Drawings:
Komárek 1992
Application technology:
Literature:

  2.1 taxonomy: Hollerbach 1934, Hollerbach 1935, Elenkin 1938, Geitler 1942, Hollerbach et al. 1953, Hollerbach et al. 1955, Bourrelly 1970, Kondrateva et al.1984, Bourrelly 1985, Komárek 1992, Komárek & Anagnostidis 1998
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: