162,411 species and infraspecific names are in the database, 22,760 images, 64,001 bibliographic items, 474,997 distributional records.

Borzia F.Cohn ex M.Gomont, 1892

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

Holotype species: Borzia trilocularis Cohn ex Gomont

Original publication and holotype designation: Gomont, M. (1892 '1893'). Monographie des Oscillariées (Nostocacées Homocystées). Deuxième partie. - Lyngbyées. Annales des Sciences Naturelles, Botanique, Série 7 16: 91-264, pls 1-7.
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Komárek, J., Kaštovský, J., Mares, J. & Johansen, J.R. (2014). Taxonomic classification of cyanoprokaryotes (cyanobacterial genera) 2014, using a polyphasic approach. Preslia 86: 295-335.

Description: Filamentous; solitary filaments or small groups of trichomes. trichomes with a limited growth, usually short (with up to 16 cells/trichome), 0.5-7 _m wide, uniseriate, unbranched, more or less straight or slightly curved, isopolar, not attenuated to the ends, mainly constricted, rarely unconstricted at the crosswalls. Sheaths lacking, sometimes (facultatively) with fine mucilage enveloping trichomes. All cells morphologically and functionally identical, isodiametric or slightly shorter or longer than wide, cylindrical to barrel-shaped, end cells widely rounded; thylakoids probably concentrically arranged along the cell walls. Heterocytes and akinetes missing. Reproduction by transverse cell division, all cells capable of division. Trichomes divide between vegetative cells without cell death, after they reach a distinct length (usually only with several cells). Trichome fragments nonmotile (hormocytes), isopolar, germinate at both ends. The different species occur in periphyton and metaphyton of clear, mainly small freshwater bodies with aquatic plants (3 species), epiphytically (endogloeic) in the mucilage of other freshwater algae (1), benthic in lakes (1) or aerophytic on calcareous substrates (2). Known mainly from Europe. Type species probably has cosmopolitan distribution, but not common.

Information contributed by: J. Komárek. The most recent alteration to this page was made on 3 Mar 2015 by M.D. Guiry.

Numbers of names and species: There are 18 species names in the database at present, as well as 1 infraspecific names. Of the species names, 13 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.

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: 03 March 2015 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43575

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 29 July 2021.

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