Johannesbaptistia G.De Toni, 1934

Holotype species: Johannesbaptistia primaria (N.L.Gardner) G.De Toni

Original publication and holotype designation: De Toni, G. (1934). Noterelle di nomenclatura algologica. I. Alcuni casi di omonimia (Missoficee). pp. [7]. Brescia: Privately published.

Description: Unicellular-pseudofilamentous; pseudofilaments free-living or in small groups, solitary, cylindrical, to more than 1 mm long, uniseriate, very rarely pseudodichotomously divaricated and again joined, composed of the simple row of "transversely elongated", more or less discoid cells, which are oriented by their "longer" axis crosswise to the axis of pseudofilaments and of the enveloping sheath. Sheaths gelatinous, colorless, not layered, fine, thin to slightly widened from cells and sometimes diffluent at the margin. Cells slightly or clearly distant from one another, only after division the daughter cells remain joined for a short time; 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. Cell division only in one plane in succeeding generations, always crosswise to the axis of pseudofilaments, i.e., crosswise to the shorter axis of cells. Reproduction probably by fragmentation of pseudofilaments. Found several times; only type species studied. J. pellucida occurs in metaphyton of unpolluted swamps, small water bodies with plenty of submerged 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 therma1 springs in Yellowstone Park (USA). A poorly known genus, revision from cultures is necessary.

Information contributed by: J. Komárek. The most recent alteration to this page was made on 2024-06-12 by Luka Sato.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Strunecký, O., Ivanova, A.P. & Mares, J. (2022 '2023'). An updated classification of cyanobacterial orders and families based on phylogenomic and polyphasic analysis (Review). Journal of Phycology 59(1): 12-51.

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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=43301

Citing AlgaeBase
Cite this record as:
Luka Sato in Guiry, M.D. & Guiry, G.M. 12 June 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 November 2024