156,318 species and infraspecific names are in the database, 22,002 images, 60,418 bibliographic items, 445,940 distributional records.

Cylindrospermum Kützing ex É.Bornet & C.Flahault, 1886

Classification:
Empire Prokaryota
Kingdom Eubacteria
Subkingdom Negibacteria
Phylum Cyanobacteria
Class Cyanophyceae
Subclass Nostocophycidae
Order Nostocales
Family Nostocaceae

Lectotype species: Cylindrospermum majus Kützing ex Bornet & Flahault

Original publication:Bornet, É. & Flahault, C. (1886 '1888'). Revision des Nostocacées hétérocystées contenues dans les principaux herbiers de France (quatrième et dernier fragment). Annales des Sciences Naturelles, Botanique, Septième Série 7: 177-262.
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Type designated in Geitler, L. (1942). Schizophyta: Klasse Schizophyceae. In: Die natürlichen Pflanzenfamilien, Sweite Auflage. (Engler, A. & Prantl, K. Eds) Vol.1b, pp. 1-232. Leipzig: Wilhelm Engelmann.

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: Filaments in fine or compact, mucilaginous mats, slightly curved or irregularly coiled, cylindrical along the whole length or slightly narrowed in the middle, without sheaths, but with very fine, colorless, homogeneous, diffluent mucilage, symmetrical, constricted at the crosswalls. Cells cylindrical, more or less isodiametric or longer than wide, rarely barrel-shaped or almost spherical, without aerotopes, sometimes with dispersed granules and visible chromatoplasm, pale or bright blue-green. Heterocytes always only terminal (arise from end cells), ovoid, oval or conical, unipored, developing at both ends of trichomes, rarely only at the one end (facultatively ?). Akinetes develop only close to heterocytes, at both trichome ends, rarely spherical, usually oval or cylindrical, solitary or in rows up to 7, sometimes with sculptured outer cell wall layers. Cells divide crosswise and grow more or less into the original size before the next division. Without meristematic zones, all cells capable of dividing. Reproduction by trichome fragmentation into hormogonia and by akinetes. Mainly periphytic species, growing in benthos, on aquatic plants and submerged woody and stony substrates, usually in unpolluted or slightly eutrophic waters. Several species grow in soils. Mainly with geographically limited areas.

Information contributed by: J. Komárek. The most recent alteration to this page was made on 4 Mar 2015 by M.D. Guiry.

Numbers of names and species: There are 67 species names in the database at present, as well as 22 infraspecific names. Of the species names, 52 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
Komárek, J., Zapomelova, E. & Hindak, F. (2010). Cronbergia gen. nov., a new cyanobacterial genus (Cyanophyta) with a special strategy of heterocyte formation. Cryptogamie Algologie 31(3): 321-341.

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: 11 April 2002 by M.D. Guiry

Verified by: 04 March 2015 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43595

Citing AlgaeBase
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 17 September 2019.

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