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Rhabdogloea

Generic name: RHABDOGLOEA Schröder, 1917. Ber. Deutsch. Bot. Ges. 35: 549.
Synonyms:
Diagnosis:
Type species: Rhabdogloea ellipsoidea Schröder 19l7. From the synonymous genus Dactylococcopsis were described more than 30 species, which all belong to simple green algae from different genera.
Descriptions:
Komárek (2003): Fusiform cells are arranged irregularly, distant, rarely more or less in one direction, in microscopic mucilaginous colonies. Mucilage is fine, homogeneous, colorless, and usually diffuse or indistinct at the margin. Cells are fusiform or cylindrical with conical cell ends, sometimes pointed, often slightly curved, (1.8)3-12(22) X (0.5)1-3.5(6) μm, with pale blue-green or olive-green content. Involution filamentous cells are up to more than 25 μm long (known only from culture). Cell division is by binary fission, transverse to the long axis into two more or less isomorphic daughter cells. Reproduction is by disintegration of colonies.
Komárek & Anagnostidis (1998): Colonies mucilaginous, microscopic (rarely macroscopic), irregular, usually free-floating, with cells distant from one another, situated irregularly (more or less parallel in young colonies) in fine, diffluent (rarely limited), colourless, structureless mucilage; number of cells usually small
(sometimes only 1-3 cells in a colony). Cells elongate, narrow, spindle-shaped, ellipsoidal or more or less cylindrical with short attenuate and acute or acute-rounded
poles, without aerotopes, straight or slightly arcuate or sigmoidally coiled; around the cells or their small groups thereof sometimes a fine individual, homogeneous envelope. In cultures (R. smithii/ellipsoidea) pseudofilamentous formations and filamentous involution cells (like in Synechococcus) often with asymmetrical cell division.
Komárek (1992): Unicellular - colonial; colonies microscopic, containing relatively small number of cells, mucilaginous, with more or less elongated cells, disposed freely, distant one from another, sometimes oriented more or less in one direction; colonial slime colourless, without structure or very finely and indistinctly, irregularly concentrically lamellated, fine, sometimes diffluent at the margin. Sometimes few small colonies clustered together. Cells spindle-like, narrowed to both ends, pointed, rounded-pointed or narrowed-rounded, straight or curved, with pale blue-green or grey-blue, homogeneous content. Involution cells filament-like.
Geitler (1932; sub Dactylococcopsis, incl. Myxobaktron): Zellen zylindrisch und an den Enden zugespitzt, oder spindelförmig, oder ellipsoidisch und zugespitzt, gerade oder mehr oder weniger spiralig, S-förmig oder unregelmäßig gekrümmt, selten einzellen, meist zu wenigen in zarter, schwer sichtbarer Gallerte zu Kolonien vereinigt. Teilung quer.
Genotype differences, molecular data:
Reproduction strategies, life cycles, cell division:
Komárek & Anagnostidis (1998): Cell division by binary fission, transverse to the long axis into two more or less isomorphic daughter cells; the cells separate from one another before the next division. Reproduction by disintegration of colonies.
Komárek (1992): Cell division (binary fission) in two, perpendicularly to the longer axis of cells, in the middle of cells or slightly excentrically in involution cells. Cells separate soon one from another. Reproduction by disintegration of colonies and by solitary cells.
Ultrastructure:
Taxonomic position, higher hierarchy: Cyanophyceae,
Chroococcales, Synechococcaceae, Synechococcoideae
Notes to taxonomy, misinterpretations:
Ecology, ecophysiology, ecological significance:
Komárek (2003): Ten to fifteen species are known, mostly planktonic in lakes and reservoirs, but also endogloeic in Microcystis colonies (Komarek and Anagnostidis, 1998). One metaphytic species occurs in acidic peaty swamps.
Komárek (1992): Majority species planktic (usually in large lakes) or living in metaphyton of clear water bodies, one species known only from tropics. One species is kryosestonic from spring and summer snow fields.
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:
Rhabdogloea brasilica Azevedo et Kováčik
Rhabdogloea elenkini (Roll) Komárek et Anagnostidis 1995
Rhabdogloea ellipsoidea Schröder 1917
Rhabdogloea gorskii (Woloszyńska) Joosten 2006
Rhabdogloea hungarica (Kol) Hindák 1984
Rhabdogloea linearis (Geitler) Komárek 1983
Rhabdogloea minuta Hickel 1991. Archiv für Hydrobiologie/Algological Studies 64: 98
Rhabdogloea planktonica (Teiling) Komárek 1983
Rhabdogloea scenedesmoides (Nygaard) Komárek et Anagnostidis 1995
Rhabdogloea smithii (R. et F. Chodat) Komárek 1983
Rhabdogloea subtropica Hindák 1984
Rhabdogloea yucatanensis Komárek et Komárková-Legnerová 2007

Unclear taxa:
Dactylococcopsis antarctica  Fritsch 1912
Dactylococcopsis pecinatellophila W. West 1911
Dactylococcopsis planktonica f. minor Fedorov 1969
Rhabdogloea sp. sensu Anagnostidis et Roussomoustakaki 1991

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

  2.1 taxonomy: Geitler 1932, Geitler 1942, Komárek 1969,Bourrelly 1970, Komárek 1983, Hindák 1984, Bourrelly 1985, Komarek & Anagnostidis 1986, Hindák 1992, Komárek 1992, Lederer 1995, Komárek & Anagnostidis 1998, Komárek 2003
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: