Polygoniochloris (Pascher) Ettl, 1977

Holotype species: Polygoniochloris polygonia (Pascher) Ettl

Original publication and holotype designation: Ettl, H. (1977). Taxonomische Bemerkungen zu den Xanthophyceen. Nova Hedwigia 28: 555-568.

Description: Unicellular, solitary, free-living, non-motile organisms 7-19 _m diameter. Cells discoid, more or less angular, polygonal or circular with four to n angles. Length of polygonal forms 12-20 (25) _m. The margins of the cell are straight, sometimes concave or rarely convex between the angles which are blunt to rounded. Cell thickness 2.5-5 _m. Cell wall often firm, sometimes red and strongly silicified with age. Cells clearly and regularly scrobiculate (scrobiculations arranged in three directions at 60 _ to one another). When parietal ornamentation is well developed, the margin of the cell appears somewhat denticulate. Chloroplasts two to numerous, discoid to ellipsoid and parietal without pyrenoids. Oil droplets and lipids in the cytoplasm and sometimes red. Asexual reproduction by autospores with two or four autospores formed per mother cell. Naked structures observed which would suggest development of zoospores. Cysts unknown. Polygoniochloris planktonic in ponds or very small, stagnant water bodies. One species observed in an algal mat from an acid bog. Reported from central Europe, South America and one species probably cosmopolitan. Species distinguished based on the shape of the cells and on the parietal ornamentation. Bourrelly considered Polygoniochloris synonymous with Goniochloris.

Information contributed by: P. Compère. The most recent alteration to this page was made on 2021-10-05 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

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=44177

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 05 October 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 19 May 2024