161,427 species and infraspecific names are in the database, 22,723 images, 62,830 bibliographic items, 473,328 distributional records.

Trochiscia Kützing, 1834

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Viridiplantae
Infrakingdom Chlorophyta infrakingdom
Phylum Chlorophyta
Subphylum Chlorophytina
Class Trebouxiophyceae
Order Chlorellales
Family Oocystaceae

Type species: a type species (generitype) appears not to have been designated.

Original publication:Kützing, F.T. (1834 '1833'). Synopsis diatomearum oder Versuch einer systematischen Zusammenstellung der Diatomeen. Linnaea 8: 529-620, pls XIII-XIX [79 figs].
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: John, D.M. & Tsarenko, P.M. (2002). Order Chlorococcales. In: The Freshwater Algal Flora of the British Isles. An identification guide to freshwater and terrestrial algae. (John, D.M., Whitton, B.A. & Brook, A.J. Eds), pp. 327-409. Cambridge: Cambridge University Press.

Description: Thalli unicellular and solitary (rarely aggregated), with spherical to subspherical cells 8-50 µm diameter. Cell walls thick, variously sculptured with numerous short spines 4-7 µm long, ridges, reticulations or rounded projections. Cells uninucleate; single chloroplast variable, stellate and axial or parietal; with or without pyrenoids. Asexual reproduction by division of the protoplast into 4-16 to many autospores or zoospores; released by rupture of parental cell wall. Sexual reproduction unknown. Trochiscia planktonic in permanent or semipermanent freshwater systems; in temperate waters of Northern Hemisphere with numerous reports from Europe and North America. Genus also placed in Oocystaceae by some authors. Species distinguished by details of cell morphology, especially the structure and ornamentation of the cell walls. Many described Trochiscia species require culturing to confirm their assignment to this genus; many taxa may represent zygospores or aplanospores of other chlorophycean algae.

Information contributed by: D. Garbary. The most recent alteration to this page was made on 9 Jul 2012 by Michael Guiry.

Numbers of names and species: There are 81 species names in the database at present, as well as 10 infraspecific names. Of the species names, 33 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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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: 29 January 2001 by M.D. Guiry

Verified by: 09 July 2012 by Michael Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43293

Citing AlgaeBase
Please cite this record as:
Michael 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 07 May 2021.

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