153,585 species and infraspecific names are in the database, 20,980 images, 59,387 bibliographic items, 411,011 distributional records.

Microcystis Lemmermann, 1907, nom. et typ. cons.

Classification:
Empire Prokaryota
Kingdom Eubacteria
Subkingdom Negibacteria
Phylum Cyanobacteria
Class Cyanophyceae
Subclass Oscillatoriophycidae
Order Chroococcales
Family Microcystaceae

Lectotype species: Microcystis aeruginosa (Kützing) Kützing

Original publication and holotype designation: Lemmermann, E. (1907). Algen I (Schizophyceen, Flagellaten, Peridineen). In: Kryptogamenflora der Mark Brandenburg und angrenzender Gebiete herausgegeben von dem Botanishcen Verein der Provinz Brandenburg. Dritter Band. ( Eds), pp. 1-304. Leipzig: Verlag von Grebrüder Borntraeger.
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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 gelatinous, free floating or attached to the substrate, microscopic, spherical, discoid or irregular, later usually macroscopic, amorphous, irregular, sometimes net-like, with numerous cells without own mucilaginous envelopes, irregularly distributed within the common slime, sometimes densely agglomerated; colonial mucilage colorless, usually homogeneous, fine, diffluent (staining !), rarely with the limited, sometimes refractive margin. Cells spherical or (after division) hemispherical, with homogeneous, blue-green, greyish or yellowish content, in several planktonic species with several up to numerous aerotopes; sometimes with visible chromatoplasm. Several strains toxic, and producing pcyclocitral. Cell division in 3 planes in successive generations, perpendicular to one another; daughter cells soon separate from one another, and grow into the original size and shape before the next division. Reproduction by the dissociation of colonies. Free floating in plankton of freshwater, more or less eutrophic water reservoirs (sometimes forming heavy water blooms). Several species live benthic in moors, epiphytic or epilithic in different types of stagnant and running waters and on wet rocks. Many species have world wide distribution (with exception of subpolar regions), but several taxa are ecologically and therefore also phytogeographically limited. Most of the non-planktonic species without ability to form gas vesicles probably belong to the genus Aphanocapsa.

Information contributed by: J. Komárek. The most recent alteration to this page was made on 19 Oct 2015 by M.D. Guiry.

Numbers of names and species: There are 111 species names in the database at present, as well as 47 infraspecific names. Of the species names, 51 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.

References
Thomazeau, S., Houdan-Fourmont, A., Couté, A., Duval, C., Couloux, A., Rousseau, F. & Bernard, C. (2010). The contribution of sub-Saharan African strains to the phylogeny of cyanobacteria: focusing on the Nostacaceae (Nostocales, Cyanobacteria). Journal of Phycology 46(3): 564-579.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

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.

Created: 29 January 2001 by M.D. Guiry

Verified by: 19 October 2015 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43294

Citing AlgaeBase
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 15 November 2018.

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