Gloeocapsa Kützing, 1843, nom. cons.

Holotype species: Gloeocapsa atrata Kützing

Original publication and holotype designation: Kützing, F.T. (1843). Phycologia generalis oder Anatomie, Physiologie und Systemkunde der Tange. Mit 80 farbig gedruckten Tafeln, gezeichnet und gravirt vom Verfasser. pp. [part 1]: [i]-xxxii, [1]-142, [part 2:] 143-458, 1, err.], pls 1-80. Leipzig: F.A. Brockhaus.

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Description: Unicellular-colonial; colonies microscopic, small in a form of irregular aggregations, or large, up to macroscopic, gelatinous, amorphous, sometimes covering large areas of wet stony substrates; colonies composed of groups of cells, which are closed in mucilaginous, usually wide and concentrically lamellated envelopes, in several species intensely reddish, bluish, orange or yellowish colored; cells situated in colonies irregularly, more or less distant one from another, in old colonies in great numbers. Mucilaginous envelopes fine, but layered and limited; solitary cells produce soon after division their own, wide envelopes, which do not just copy the cell shape. Cells spherical, only shortly after division hemispherical, pale blue-green or olive-green, usually with slightly granular content. During vegetation cycles develop morphologically different stages, conditioned by ecological influences. Cell division in three perpendicular planes in successive generations; the daughter cells soon separate from one another after division, they develop their mucilaginous envelopes and grow into the original spherical shape and size before the next division. Reproduction by dissociation of colonies into small cell clusters or into solitary cells with narrow gelatinous envelopes. Nanocytic cell division known. The described akinetes are probably only resting stages with dense mucilaginous envelopes, caused by environmental, unfavorable conditions (status, ecomorphoses), not real akinetes as known in filamentous cyanophytes. Most species known from wet or dry, periodically moistened stony and rocky walls and from rocks with streaming water, distributed all over the world. The taxonomy of populations from different areas is not quite clear, but most species are considered worldwide in distribution. They occur mainly in mountains, but also in all other rocky areas, including the arid regions. Few species are periphytic and metaphytic in waters with aquatic plants, very rarely occur in plankton and secondary in cryoseston in high mountains.

Information contributed by: J. Komárek. 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: 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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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 26 February 2024

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