Oocystis Nägeli ex A.Braun, 1855
Holotype species: Oocystis naegelii A.Braun
Original publication and holotype designation: Braun, A. (1855). Algarum unicellularium genera nova et minus cognita praemissis observationibus de algis unicellularibus in genere. pp. -114, 6 pls. Lipsiae [Leipzig]: apud W. Engelmann.
Taxonomic status: currently recognized as a distinct genus.
Gender: This genus name is currently treated as feminine.
Most recent taxonomic treatment adopted: Tsarenko, P.M. (2011). Trebouxiophyceae. In: Algae of Ukraine: diversity, nomenclature, taxonomy, ecology and geography. Volume 3: Chlorophyta. (Tsarenko, P.M., Wasser, S.P. & Nevo, E. Eds), pp. 61-108. Ruggell: A.R.A. Gantner Verlag K.-G..
Description: Cells solitary or in 2-4-8-(?16)-celled colonies within a thin, hyaline mucilaginous envelope or within an expanded mother cell wall. Colony oval to ellipsoid, up to 77 &m in diameter. Cells fusiform, ellipsoid, oval to nearly spherical, 7-46 x 12-50 &m. Cell wall smooth, sometimes with polar thickenings. Chloroplast one to many, parietal, bowl-shaped or discoid, without a pyrenoid. Asexual reproduction by 2-4-8-(16) autospores released by rupture of the mother cell wall. Sexual reproduction and flagellated stages unknown. Oocystis planktonic, predominantly freshwater; cosmopolitan. Komárek & Fott (1983) list 28 species with an additional 16 species designated as incompletely described or difficult to identify. Hindák (1988), based upon Skuja's (1964) examination of the type material the cells of which lack pyrenoids, assigns to the genus Oocystis only those forms without a pyrenoid and lists 8 species for the genus; he assigns 17 species possessing a pyrenoid, four new species and thirteen species included in the genus Oocystis by Komárek & Fott (1983) to Oocystella Lemmermann.
Information contributed by: G. Dillard. The most recent alteration to this page was made on 11 Nov 2015 by M.D. Guiry.
Numbers of names and species: There are 75 species names in the database at present, as well as 61 infraspecific names. Of the species names, 53 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.
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: 11 April 2002 by M.D. Guiry
Verified by: 11 November 2015 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43441
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 19 November 2018.