154,548 species and infraspecific names are in the database, 21,106 images, 59,782 bibliographic items, 419,596 distributional records.

Gloeotrichia J.Agardh ex Bornet & Flahault, 1886

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

Holotype species: Gloeotrichia pisum Thuret ex Bornet & Flahault

Original publication and holotype designation: Bornet, E. & Flahault, C. (1886 '1887'). Revision des Nostocacées hétérocystées contenues dans les principaux herbiers de France (deuxième fragment). Annales des Sciences Naturelles, Botanique, Septième Série 4: 343-373.
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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: Filamentous-colonial; trichomes heteropolar with basal heterocytes and apical hair-like ends with own sheaths, united radially into gelatinous, hemispherical or spherical colonies, which are microscopic up to several cm in diam., olive-green, yellow-green, brown or dark blue-blackish. The whole colony enveloped by a fine or firm slime; trichomes always oriented with heterocytes into the center of the colony. Trichomes rarely false branched (during trichome division), the branches separate soon from the mother trichome, but remain parallel and radially located within the colonial slime and form their own gelatinous sheaths. Colonies are joined to the substrate or free floating. Trichomes uniseriate, rarely with intercalary heterocytes (developing before or during trichome dissociation), constricted or unconstricted at the crosswalls, more or less straight or coiled. Sheaths are always present, but sometimes gelatinize within the mucilage of colonies, especially near apical parts of trichomes (near the margin of a colony). Upon the basal heterocytes oval or cylindrical akinetes develop (solitary or in rows) at the end of the vegetation periods. The cells in several species (particularly in hormogonia) contain aerotopes (planktonic species). Cell division perpendicular to the long axis of a trichome, usually in meristematic zones. Reproduction by dissociation of trichomes within colonies and, particularly, by hormogonia, differentiating after the separation of the apical hair by help of necridic cells, and sometimes liberating from old colonies. Division of colonies. Two species are euplanktonic, few species develop periphytically on aquatic plants and on submerged stones and wood, but later sometimes liberate from the substrate and flow on the surface. Several species live in the detritus (metaphyton) in swamps and reservoirs with abundant aquatic vegetation. The majority of species have limited areas of distribution (tropic, nordic, etc.). All species are freshwater, only the planktonic G. echinulata grows in both fresh and in brackish water of the temperate zone (e.g. in Baltic Sea).

Information contributed by: J. Komárek. The most recent alteration to this page was made on 14 Apr 2015 by Salvador Valenzuela Miranda.

Numbers of names and species: There are 33 species names in the database at present, as well as 14 infraspecific names. Of the species names, 26 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: 11 April 2002 by M.D. Guiry

Verified by: 14 April 2015 by Salvador Valenzuela Miranda

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43613

Citing AlgaeBase
Please cite this record as:
Salvador Valenzuela Miranda 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 February 2019.

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