160,132 species and infraspecific names are in the database, 22,604 images, 62,233 bibliographic items, 471,453 distributional records.

Anabaena Bory ex Bornet & Flahault, 1886, nom. cons.

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

Holotype species: Anabaena oscillarioides Bory ex Bornet & Flahault

Original publication and holotype designation: 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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Taxonomic status: currently recognized as a distinct genus.

Gender: This genus name is currently treated as feminine.

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: Filamentous; filaments solitary or in free clusters (subg. Dolichospermum) or in macroscopic mats on the substrate (subg. Anabaena), usually with coiled and tangled, sometimes up to screw-like coiled, rarely with more or less parallel oriented trichomes, along the length of the same width or slightly narrowed to the ends, with more or less deep constrictions at cross walls, always without firm sheaths, but sometimes with mucilaginous, hyaline, colourless, often diffluent envelopes; trichomes uniserial, often moniliform, isopolar, always metameric (heterocytes develop solitary and intercalary in more or less certain distances one from another; in one developed trichome always 3-9, rarely more, heterocytes). Cells cylindrical, barrel-shaped or spherical, shorter up to longer than wide, pale or bright blue-green or olive-green, containing aerotopes (subg. Dolichospermum) or without aerotopes, but sometimes with granular content (subg. Anabaena); terminal cells sometimes slightly elongated, conical, conical rounded or spherical, not vacuolized. Heterocytes spherical, widely oval or cylindrical, sometimes elongated, usually slightly greater than vegetative cells. Akinetes spherical, oval or cylindrical, solitary or several in a row, intercalary, developing always paraheterocytic, close to heterocytes from both sides, or slightly distant from them.

Cells divide cross-wise and grow to the original size before the next division; without meristematic zones. Reproduction by trichome fragmentation (usually at heterocytes) and by akinetes.

Information contributed by: J. Komárek. The most recent alteration to this page was made on 1 Dec 2020 by M.D. Guiry.

Comments: Planktonic species, sometimes forming water blooms (mainly from the subg. Dolichospermum) or in mats covering different substrates, water plants, submersed woods, stones etc. Several species grow benthic or in soils, several are known from salinic (brackish) biotopes. Many species have limited geographic areas of distribution. Several species benthic or in soils, several are known from saline (brackish) habitats. Many species have limited geographic areas of distribution, but this genus is widespread and common.

Numbers of names and species: There are 337 species names in the database at present, as well as 231 infraspecific names. Of the species names, 151 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
Werner, V.R., Laughinghouse, H.D.IV, Fiore, M.F., Sant'Anna, C.L., Hoff, C., de Souza Santos, K.R., Neuhaus, E.B., Molica, R.J.R., Honda, R.Y. & Echenique, R.O. (2012). Morphological and molecular studies of Sphaerospermopsis torques-reginae (Cyanobacteria, Nostocales) from South American water blooms. Phycologia 51(2): 228-238.

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: 28 December 2000 by M.D. Guiry

Verified by: 01 December 2020 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43086

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 03 March 2021.

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