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Pseudophormidium

Generic name: PSEUDOPHORMIDIUM (Forti) Anagnostidis et Komárek, 1988. Algolog. Stud. 50-53: 409.
Synonyms:
Diagnosis:
Type species:Pseudophormidium phormidioides (Hansgirg ex Forti) Anagnostidis et Komárek 1988. - 14 species.
Descriptions:
Komárek (1992):Filamentous; filaments solitary, joined into microscopic or macroscopic clusters or mats (strata) covering the substrate, obligatory with firm, irregularly tube-like, colourless sheaths, commonly and intensely irregularly falsely branched, sometimes with two parallel trichomes in a sheath. Trichomes often fragmentated,. cyrrndical, isopolar; usually short, irregularly curved and coiled, 1-18 um wide, uniserial, composed of barrel-shaped or cylindrical cells, constricted or unconstricted at cross walls, not attenuated or slightly attenuated to the ends, immotile. Cells isodiametrical or slightly longer or shorter than wide, without aerotopes, but usually irregularly granulated or with several prominent granules, blue-green, greyish blue-green or pinkish; end cells rounded or conical-rounded, sometimes with thickened outer cell wall. Heterocytes and akinetes absent.
Genotype differences, molecular data:
Reproduction strategies, life cycles, cell division:
Komárek (1992): Cell division crosswise, perpendicularly to the long axis of a trichome, daughter cells grow +/- up to the original size before the next division. All cells capable to divide, but the indistinct meristematic zones arise. Reproduction by intense and common fragmentation of trichomes into motile hormogonia or immotile hormocytes (7), usually by help of necridic cells.
Ultrastructure:
Taxonomic position, higher hierarchy:
Cyanophyceae, Oscillatoriales, Phormidiaceae, Phormidioideae
Notes to taxonomy, misinterpretations:
Ecology, ecophysiology, ecological significance:
Komárek (1992): Periphytic species, known from soils, different submerse substrates (mainly stones), one species known from streams with intensely flowing water, another species lives endogloeic within mucilage of other algae.
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:
Pseudophormidium africanum (Borge) Anagnostidis et Komárek 1988
Pseudophormidium batrachospermi (Starmach) Anagnostidis et Komárek 1988
Pseudophormidium battersii  (Gomont) Anagnostisdis 2001
Pseudophormidium flexuosum (Gardner) Anagnostidis et Komárek 1988
Pseudophormidium fortii (Frémy) Anagnostidis et Komárek 1988
Pseudophormidium golenkinianum (Gomont) Anagnostidis 2001
Pseudophormidium hansgirgii (Schmidle) Anagnostidis et Komárek 1988
Pseudophormidium hollerbachianum (Elenkin) Anagnostidis 2001
Pseudophormidium indicum (Dixit) Anagnostidis et Komárek 1988
Pseudophormidium pauciramosum (Anisimova) Anagnostidis 2001
Pseudophormidium phormidioides (Hansgirg ex Forti) Anagnostidis et Komarek 1988
Pseudophormidium purpureum (Gomont) Anagnostidis et Komárek 1988
Pseudophormidium radiosum (Gomont) Anagnostidis et Komárek 1988
Pseudophormidium rhenanum (Schmidle) Anagnostidis 2001
Pseudophormidium speaeoides (Čado) Anagnostidis 2001
Pseudophormidium tatricum (Starmach) Anagnostidis 2001
Pseudophormidium tauricum (Voronichin) Anagnostidis et Komárek 1988
Pseudophormidium tenue (Thuret ex Gomont) Anagnostidis et Komárek 1988
Pseudophormidium viride (Schwabe) Azevedo 1991

Unclear taxa
Plectonema andinum Schwabe 1960
Plectonema indicum  sensu Gruia 1962
Plectonema monodii Compére 1970
Plectonema polymorphum Schwabe 1960
Plectonema puteale (Kirchner) Hansgirg 1885
Plectonema rheanum f. scytonemaeforme Schwabe 1960
Plectonema rugosum Jao 1947
Plectonema schmidlei sensu Schwabe 1947
Plectonema spirale Schwabe et Ayouty 1966
Plectonema subtile Gayral et Mazancourt 1960

Keys:
List of stains:
Drawings:
Komárek 1992
Application technology:
Literature:

  2.1 taxonomy: Starmach 1966, Anagnostidis & Komárek 1988, Komárek 1992
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: