155,874 species and infraspecific names are in the database, 21,968 images, 60,248 bibliographic items, 439,627 distributional records.

Brachytrichia Zanardini ex Bornet & Flahault, 1886

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

Lectotype species: Brachytrichia quoyi Bornet & Flahault

Original publication: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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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: Filamentous - thallose; thallus flat to hemispherical, to 5 cm in diam., mucilaginous, sometimes crusty, hollow in the center when old, dark green or brownish, composed of horizontal layers of freely tangled or more or less parallel and radial (vertical to substrate) true branched trichomes, without loop formations. Sheaths present in young trichomes, colorless or yellowish, absent and diffluent in old trichomes, but filaments enveloped by common, limited mucilage. Trichomes more or less cylindrical in the middle part, uniseriate; trichomes and branches toward the ends continually narrowed, sometimes up to the hairs with narrow, elongated cells; old trichomes (in old parts of thallus) more freely coiled, thinner, with more elongate and cylindrical cells; types of true branching: reverse Y-type, rarely V-type. Heterocytes intercalary, spherical, barrel-shaped, sometimes shorter or longer than wide, usually wider than vegetative cells. Akinetes missing. Cell division transverse, in meristematic zones. Reproduction by hormogonia, which fragment from branches after separation of terminal hairs. Marine, in littoral on stones and shells. Occurs on limestone coasts in tropical and subtropical seas worldwide.

Information contributed by: J. Komárek. The most recent alteration to this page was made on 23 Nov 2015 by M.D. Guiry.

Numbers of names and species: There are 8 species names in the database at present, of which 3 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.

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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: 23 November 2015 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43091

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 20 July 2019.

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