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Seguenzaea

Generic name: SEGUENZAEA Borzì 1907. Atti Congr. Nat. Ital. Milano 1906: 372.
Synonyms:
Diagnosis:
Type species: Seguenzaea sicula Borzì 1907.
Descriptions:
Komárek (1992): Filamentous-thallous; filaments composed from trichomes and sheaths; trichomes of two types, torulous,creeping on the substrate and cylindrical, erect, joined parallely in densely agglomerated fascicles (macroscopically visible); creeping filaments uni- or (rarely) multiseriate, hypothallic, sometimes true branched (T-type of branches), with more or less barrel-shaped cells and solitary intercalar, barrel-shaped heterocytes; erect trichomes more or less cylindrical, constricted or unconstricted at cross walls, with solitary intercalar, usually cylindrical (sometimes very long) heterocytes. In both basal and particularly erect filaments common false branching, usually with one lateral branch (rarely with two branches),diverging at heterocytes. Sheaths thin, firm, usually not la- mellated, colourless. Cells pale, olive or bright blue-green, with solitary distinct granules. Akinetes not known.
Genotype differences, molecular
data:
Reproduction strategies, life cycles, cell division:
Komárek (1992): Cell division mainly crosswise, sometimes asymmetrically. Reproduction by 8-10- celled hormogonia, which separate serially from the ends of branches by help of necridic cells, by hormocytes (short ensheathed branches) and by solitary cells, clusters or 2-celled groups of cells, originating from the disintegrating old trichomes.
Ultrastructure:
Taxonomic position, higher hierarchy:
Cyanophyceae, Stigonematales, Borzinemataceae
Notes to taxonomy, misinterpretations:
Ecology, ecophysiology, ecological significance:
Komárek (1992): Aerophytic and atmophytic species, described from wet walls and mosses, from the nature and glasshouses; known from Italy and Austria.
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:
Seguenzaea anthonyi Gupta 1955
Seguenzaea minor Geitler 1932
Seguenzaea sicula Borzì 1907
Keys:
List of stains:
Drawings:
Komárek 1992
Application technology:
Literature:

  2.1 taxonomy: Geitler 1932, Geitler 1942, Bourrelly 1970, Komárek 1992
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: