Microcrocis P.G.Richter, 1892
Holotype species: Microcrocis dietelii P.G.Richter
Currently accepted name for the type species: Microcrocis geminata (Lagerheim) Geitler
Original publication and holotype designation: Hauck, F. & Richter, P. (1885-1896). Phykotheka universalis. Fasc. I-XV. pp. no. 1-750. Leipzig.
Description: Unicellular-colonial; colonies many-celled, microscopic, rarely macroscopically remarkable (with many cells), table-like, flat or slightly waved, uniseriate, mucilaginous, usually with irregular outline, with cells gathered in one layer in the plane of colony; in young colonies are the cells more or less in rows perpendicular to one another, in old colonies irregularly and usually very densely gathered, in several cases up to polygonal in outline (subg. Beckia). Mucilaginous envelope fine, colorless, diffluent; cells without their own mucilaginous envelopes. Cells rarely spherical when young, later (at least in a part of the life cycle) elongated, situated perpendicular to the plane of colony, widely oval, oval to rod-like, with rounded ends, sometimes several hundreds in a colony; cells usually without visible chromatoplasm (irregular arrangement of thylakoids within cells). Division of cells more or less in two planes, perpendicular to one another and to the plane of colony (i.e., lengthwise); the cells form in young colonies the perpendicular rows, later in more-celled colonies are arranged irregularly. Reproduction by the dissociation of colonies. Epipelic and metaphytic species growing mainly in small water bodies (pools and waters with acquatic vegetation or with sandy substrate), but 2 species are known from brackish to saline localities in flat marine beaches and in riverine estuaries (M. sabulicola, M. marina
Information contributed by: J. Komárek. The most recent alteration to this page was made on 2023-08-25 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: Polyakova, E., Averina, S. & Pinevich, A. (2023). Geminocystis urbisnovae sp. nov. (Chroococcales, Cyanobacteria): polyphasic description complemented with a survey of the family Geminocystaceae. Algae 38(2): 93-110.
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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera,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=44298
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 25 August 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 November 2024
