Ammatoidea West & G.S.West, 1897
Holotype species: Ammatoidea normanii West & G.S.West
Original publication and holotype designation: West, W. & West, G.S. (1897). A contribution to the freshwater algae of the south of England. Journal of the Royal Microscopical Society, London 1897: 467-511.
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; filaments isopolar, long, solitary or in groups, cylindrical, in the middle usually arcuated or irregularly curved, with firm sheaths, which are sometimes yellowish brown coloured and layered; sometimes occur false branchings. Trichomes at cross walls slightly constricted or unconstricted, uniserial, attenuated at both ends and sometimes terminated by long, thin hairs with co1ourless cells. Heterocytes and akinetes always absent.
Information contributed by: J. Komárek. The most recent alteration to this page was made on 3 Mar 2015 by M.D. Guiry.
Comments: The type species (A. normannii) occurs sporadically in periphyton and metaphyton on water plants in clear and cold streaming waters and in littoral of clear, unpolluted lakes. Localities are known allover the world, but the taxonomic identity of all floristic data is not clear. One species was described from a spring in Georgia (USSR), the another one from thermal springs in the Yellowstone National Park (U.S.A.).
Numbers of names and species: There are 11 species names in the database at present, of which 11 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: 16 April 2003 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=45086
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 05 December 2020.