Tolypothrix Kützing ex& Flahault, 1886
Lectotype species: Tolypothrix distorta Kützing ex Bornet & Flahault
Original publication:Bornet, É. & Flahault, C. (1886 '1887'). Revision des Nostocacées hétérocystées contenues dans les principaux herbiers de France (Troisième fragment). Annales des Sciences Naturelles, Botanique, Septième série 5: 51-129.
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.
Gender: This genus name is currently treated as feminine.
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; filaments heteropolar, united in fasciculate, caespitose colonies, or (later) clusters or wooly mats, with basal parts with heterocytes and free apical ends, commonly falsely branched, usually with solitary lateral branches (rarely with geminate branches - mainly in cultures); branches initiate usually at originally intercalary heterocytes (which are often unipored), long, waved, diverging from the main filaments or for a short distance joined to the main filament and later diverging. Sheaths thin or thick, joined to the trichome, sometimes lamellated, colorless or yellow-brown, open at the apex. Trichomes and branches uniseriate, with one or several basal heterocytes (from which the basal one is usually unipored), cylindrical, not attenuated at the end, constricted or unconstricted at the crosswalls. Cells cylindrical to barrel-shaped, isodiametric or slightly longer or shorter than wide, without aerotopes, sometimes with several granules, blue-green, olive-green, greyish or reddish, end cells slightly narrowed or widened and rounded, sometimes to spherical, always without calyptra, sometimes vacuolized. Akinetes known only rarely in few species. Cells divide crosswise to the trichome axis, with subterminal meristematic zones. Reproduction by hormogonia, which separate at both ends, but after heterocyte formation (usually in pairs) change in heteropolar growth.
Information contributed by: J. Komárek & M.D. Guiry. The most recent alteration to this page was made on 5 Jul 2021 by M.D. Guiry.
Comments: Mainly submersed, growing in littoral of unpolluted reservoirs on stones or among other algae and aquatic plants, in springs, mineral springs, streams, pools, etc.; several species are ecologically limited (they grow only in moors, alkaline swamps, in limestone areas, etc.). Many species are known only from tropical biotopes, however, they need mostly taxonomic revisions. Several species are described from aerophytic habitats (wet sandy soils, bark of trees, wet stones, calcareous or sandstone walls, etc.).
Numbers of names and species: There are 93 species names in the database at present, as well as 30 infraspecific names. Of the species names, 65 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.
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: 05 July 2021 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43599
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 26 October 2021.