Polyedriella Pascher, 1930
Holotype species: Polyedriella helvetica Vischer & Pascher
Currently accepted name for the type species: Vischeria helvetica (Vischer & Pascher) D.J.Hibberd
Original publication and holotype designation: Pascher, A. (1930). Zur Kenntnis der heterokonten Algen. Archiv für Protistenkunde 69: 401-451.
Request PDFPrecise date of publication: 5 Feb 1930
Description: Unicellular, solitary, free-living and non-motile organisms 7-20 _m diameter, sometimes forming ephemeral groups of two or four cells after sporulation. Cells polyhedral, with a very irregular outline, sometimes rhombic with the edges slightly rounded to very blunt and with multiple angles. The number of faces is variable and their surface is sometimes concave. Cell wall relatively firm, often reddish, and always seems to have ornamentation that is sometimes course. In one species, each angle has a short spine. In old cells the cell wall is strongly refringent, possible silicified. Chloroplasts parietal, one or two per cell, cup-shaped and often lobed, and frequently unequal in the same cell. Oil globules, lipids and refringent crystals common. Asexual reproduction by autospores with two or four spherical autospores (when young) formed per mother cell. Zoospores produced in one species, two or four per mother cell, with single flagellum as long as the body of the cell and with a single ribbon like chloroplast. Polyedriella associated with macrophytes in ponds and bogs; known from central Europe, Spain, South America and south east Africa. Species distinguished based on cell morphology, the process of angle formation and chloroplast number. Hibberd and Leedale (1972) assigned this genus to the class Eustigmatophyceae.
Information kindly contributed by H. Pizarro & I. Izaguirre but may now be outdated.
Taxonomic status: This name is currently regarded as a synonym of Vischeria.
Gender: This genus name is currently treated as feminine.
Most recent taxonomic treatment adopted: Kawai, H. & Nakayama, T. (2015). Introduction (Heterokontobionta p.p.), Cryptophyta, Dinophyta, Haptophyta, Heterokontophyta (except Coscinodiscophyceae, Mediophyceae, Fragilariophyceae, Bacillariophyceae, Phaeophyceae, Eustigmatophyceae), Chlorarachniophyta, Euglenophyta. In: Syllabus of plant families. Adolf Engler's Syllabus der Pflanzenfamilien. Ed. 13. Phototrophic eukaryotic Algae. Glaucocystophyta, Cryptophyta, Dinophyta/Dinozoa, Haptophyta, Heterokontophyta/Ochrophyta, Chlorarachnniophyta/Cercozoa, Chlorophyta, Streptophyta p.p. (Frey, W. Eds), pp. 11-64, 103-139. Stuttgart: Borntraeger Science Publishers.
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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.
Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=43825
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 08 October 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 02 May 2024
