Chroococcus Nägeli, 1849
Holotype species: Chroococcus rufescens (Kützing) Nägeli
Original publication and holotype designation: Nägeli, C. (1849). Gattungen einzelliger Algen, physiologisch und systematisch bearbeitet. Neue Denkschriften der Allg. Schweizerischen Gesellschaft für die Gesammten Naturwissenschaften 10(7): i-viii, 1-139, pls I-VIII.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Komárek, J., Kastovsky, J., Mares, J. & Johansen, J.R. (2014). Taxonomic classification of cyanoprokaryotes (cyanobacterial genera) 2014, using a polyphasic approach. Preslia 86: 295-335.
Description: Unicellular - colonial; colonies usually microscopic, only few-celled, more or less spherical, rarely many-celled, forming macroscopic, gelatinous mats; colonial slime fine, diffluent, homogeneous and colorless or lamellated, limited and (rarely) colored; around gathered cells special own envelopes, usually copying the shape of cells, homogeneous or lamellated (up to rich lamellated) [subg. Chroococcus], or the old envelopes diffluent and the cells remain distant from one another [subg. Limnococcus]. Cells rarely spherical (young reproduction cells), usually hemispherical to irregular (often in a form of a sector of a sphere), with homogeneous or granular content, sometimes with several prominent granules visible in light microscope, pale or bright blue-green, yellowish, pinkish or violet, rarely with aerotopes (in some planktonic species); sometimes (particularly in species with larger cells) with visible chromatoplasm (thylakoids are concentrated on the periphery of cells). Division of cells in three directions perpendicular each to another in first successive generations, later more or less irregular (in other directions); daughter cells grow more or less original size before the next division, but not always into the original shape. daughter cells form their own gelatinous envelopes. Multiplications by the dissociation of colonies, sometimes up to solitary cells. Widely distributed in freshwater, less in saline localities, mainly in metaphyton of varied bodies of water, also in aerophytic, thermal and soil biotopes; a group of species lives in plankton of reservoirs (few species facultatively with aerotopes). Many species were incorrectly identified and misinterpreted repeatedly. The ecology is important for the correct determination.
Information contributed by: J. Komárek. The most recent alteration to this page was made on 5 Mar 2015 by M.D. Guiry.
Numbers of names and species: There are 119 species names in the database at present, as well as 44 infraspecific names. Of the species names, 93 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..
Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):
Click here to also show infraspecific names in the list below.
Komárek, J. (2003). Coccoid and colonial cyanobacteria. In: Freshwater Algae of North America. Ecology and Classification. (Wehr, J.D. & Sheath, R.G. Eds), pp. 59-116. Amsterdam Boston London New York Oxford Paris San Diego San Fransisco Singapore Sydney Tokyo: Academic Press.
Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
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.
Created: 28 December 2000 by M.D. Guiry
Verified by: 05 March 2015 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43062
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 20 November 2019.