Chroococcidiopsis Geitler, 1933

Holotype species: Chroococcidiopsis thermalis Geitler

Original publication and holotype designation: Geitler, L. (1933). Diagnosen neuer Blaualgen von den Sunda-Inseln. Arch. Hydrobiol. Suppl. 12: 622-634.

Description: Unicellular; spherical cells, rarely solitary, sometimes gathered in free-living irregular agglomerations or forming more or less spherical or irregular colonies. Cells or small groups of cells are enveloped by thin, firm, colorless, sometimes slightly layered sheaths (envelopes), which split during the liberation of daughter cells. Cells spherical or irregularly spherical, with a blue-green, yellowish, grayish or reddish content, sometimes slightly granular. Thylakoids usually distributed irregularly over the whole cell volume. Division of enlarged cells by different modes: (I) successively in different planes in succeeding generations (daughter cells usually do not grow into the original shape and size before next division with the exception of liberated cells; within sheath, daughter cells of different size sometimes occur); (ii) by successive or almost spontaneous irregular cell division (multiple fission) into immotile nanocytes, liberated from the enveloping sheath by an opening (or combined with gelatinization of sheaths). Reproduction by liberated daughter cells or clusters of ensheathed cells. Ecologically interesting genus: many species grow in different extreme biotopes, in periphyton of thermal and mineral springs, katharobic springs, alkaline or hypersaline swamps, aerophytic or endolithic in stones in hot or Antarctic deserts, in polar regions, or symbiotic with lichens. Several species have cosmopolitan distribution, only occurring in their special biotopes.

Information contributed by: J. Kom√°rek. The most recent alteration to this page was made on 2023-03-06 by M.D. Guiry.

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: Struneck√Ĺ, 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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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.

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 06 March 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 18 May 2024

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