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Pannus

Generic name: PANNUS Hickel, 1991. Algolog. Stud. 64: 100.
Synonyms:
Diagnosis:
Type species: Pannus spumosus Hickel 1991.
Descriptions:
Komárek & Anagnostidis (1998): Colonies microscopic, free floating, hollow, in young stages irregularly spherical with holes, later more irregular in outline, flattened, wavy or hemispherical, arcuate, clathrate or composed of subcolonies, in old stages usually elongate and lobate, with one to three layers of more or less radially or irregularly, densely distributed cells. Around colonies fine, colourless, homogeneous, watery (diffluent at the margin) mucilage. Cells spherical, with or without gas vesicles (two different genera?).
Komárek (1992): Unicellular, colonial; colonies free-floating or mixed with-other algae 1 and among water plants, microscopic, flattened, irregular in outline, clathrate and waved, composed of subcolonies, with cells situated irregularly in one plane, in a layer of 1-3; young colonies more or less spherical, old colonies irregular, many-celled. Colonial mucilage fine, homogeneous, colourless, diffluent. Cells spherical or slightly elongated (before division), after division hemispherical, pale blue-green, with or without gas vesicles, sometimes surrounded with special fine, diffluent mucilaginous envelopes.
Genotype differences, molecular data:
Reproduction strategies, life cycles, cell division:
Komárek & Anagnostidis (1998): Cell division in two planes in successive generations, perpendicularly to the surface of the colony into two equal parts. Reproduction by colony disintegration.
Komárek (1992): Cell division in two directions perpendicular to the surface of the colony. Reproduction by the disintegration of colonies.
Ultrastructure:
Taxonomic position, higher hierarchy:
Cyanophyceae, Chroococcales, Merismopediaceae, Merismopedioideae
Notes to taxonomy, misinterpretations:
Ecology, ecophysiology, ecological significance:
Komárek (1992): Free-floating (planktic) in lakes, small reservoirs, sometimes in slightly salinic water. One species originally attached to filamentous algae or submersed plants, secondary living meristonic.
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:
Pannus planus Hindák 1993
Pannus punctiferus (Komárek et Komárková-Legnerová) Joosten 2006
Pannus spumosus Hickel 1991. Archiv für Hydrobiologie/Algological Studies 64: 101

Unclear taxa:
Coelosphaerium compositum Liebetanz 1925

Keys:
List of stains:
Drawings:
Komárek 1992
Application technology:
Literature:
  2.1 taxonomy: Hickel 1991, Hindák 1992, Komárek 1992, Hindák 1993, Komárek & Anagnostidis 1998
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: