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Johannesbaptistia

Generic name: JOHANNESBAPTISTIA De Toni, 1934. Noter. Nomencl. Algol. 1: 6.
Synonyms:
CYANOTHRIX Gardner, 1926. Mem. N. Y. Bot. Garden 7: 30.[ Drouet & Daily, 1956; J. de Toni, Noter. Nomencl. Algol. 1: 6. 1934. Cyanothrix Gardner, Memo
New York Bot. Gard. 7: 30. 1927; non Schmidle, 1897.]
HETEROHORMOGONIUM Copeland, 1936 incl.
Diagnosis:
Type species: Johannesbaptistia pellucida (Dickie) Taylor et Drouet, 1938. - From 8 described species (under different generic names) only probably 3-4 are valid; well known only the type species. [Drouet & Daily, 1956; Type species: Cyanothrix primaria Gardn.]
Descriptions:
Komárek & Anagnostidis (1998): Solitary pseudofilaments, unbranched or rarely laterally or pseudodichotomously divaricate (and occasionally anastomozing), straight or slightly wavy, consisting of one row of transversally located narrow-oval cells, situated perpendicularly to the longitudinal axis of the pseudofilaments. Mucilaginous envelopes tube-like, colourless, structureless, slightly diffluent or more or less distinct at the margin, rounded at the ends. Clear spaces are visible between cells, only after division the daughter cells remain together. Cells discoid, in lateral view transversally narrow-oval pale grey-blue or blue-green with fine granular content without gas vesicles, apical cell rounded. Pseudofilaments sometimes contain numerous necridic cells.
Komárek (1992): Unicellular - pseudofilamentous; pseudofilaments free living or in small groups, solitary, cylindrical, up more than 1 mm long, uniseriate, very rarely pseudodichotomously divaricated and again joined, composed from the simple row of "transversally elongated", more or less discoid cells, which are oriented_by their "longer" axis cross-wise to the axis of pseudofilaments and of the enveloping sheath. Sheaths gelatinous, colourless, not layered, fine, thin up to slightly widened from cells and sometimes diffluent at the margin. Cells are slightly or clearly distant one from another, only after division the daughter cells remain joined short
time together; divarication starts after the shift_of one daughter cell from the original direction of pseudofilament and by the following division of both daughter cells. Cell content pale blue-green or olive- green, homogeneous or finely granular.
Genotype differences, molecular data:
Reproduction strategies, life cycles, cell division:
Komárek & Anagnostidis (1998): Cell division in one plane, perpendicular to the longitudinal axis of pseudofilaments (i. e., transversely to the longer axis of cells); reproduction by disintegration of pseudofilaments and by facultative liberation of solitary cells.
Komárek (1992): Cell division only in one plane in succeeding generations, always cross-wise to the axis of pseudofilaments, i.e., cross-wise to the shorter axis of cells. Reproduction probably by fragmentation of pseudofilliments.
Ultrastructure:
Taxonomic position, higher hierarchy:
Cyanophyceae, Chroococcales, Synechococcaceae, Synechococcoideae
Notes to taxonomy, misinterpretations:
Ecology, ecophysiology, ecological significance:
Komárek (1992): Several times was found and studied only the type species J. pellucida, which occurs in metaphyton of not polluted swamps, small water bodies with plenty of submersed vegetation and littorals of stagnant waters, all over the tropical regions and in warmer areas of the northern temperate zone. Other species have similar ecology, one species was described from thernal springs in Yellowstone Park (USA). Not yet well known genus, the revision in cultures is necessary.
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:
Johannesbaptistia pellucida (Dickie) Taylor et Drouet 1938
Johannesbaptistia schizodichotoma (Copeland) Komárek et Anagnostidis 1995
Keys:
List of stains:
Drawings:
Komárek 1992
Application technology:
Literature:

  2.1 taxonomy: Gardner 1927 (sub Cyanothrix), Taylor 1928, De-Toni 1934, Copeland 1935 (sub Heterohormogonium),
De-Toni 1936, Drouet 1936, Drouet 1938, Kiselev 1940 (sub Cyanothrix), Geitler 1942, Iengar & Desikachary 1946, Daily 1946, Desikachary 1959, Hollerbach & al. 1953, Drouet & Daily 1956, Umezaki 1961, Srinivasan 1962, Thomas at Gonzalves 1965, Bourrelly 1970, Bourrelly 1985, Islam 1985, Wenzel & de Halperin 1987, Komárek 1992, Komárek & Anagnostidis 1998
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: