Pseudoschroederia Hegewald & Schnepf, 1986

Holotype species: Pseudoschroederia robusta (Korshikov) E.Hegewald & E.Schnepf

Original publication and holotype designation: Hegewald, E. & Schnepf, E. (1986). On the structure and taxonomy of the spindle-like Chlorellales (Chlorophyta): Schroderia, Pseudoschroederia gen. nov., Closteriopsis. Arch. Hydrobiol. (Suppl. 73), Algol. Stud. 42: 21-48. [in German]

Description: Solitary, free living cells mostly without mucilage, however, P. punctata with fibrous mucilage. Cells fusiform and straight or slightly curved or sinuate, 22-84 µm long, with two long polar appendages. Basal appendage, spine like and tapering to point whereas other appendage blunt and covered with fine hairs. Cell walls mostly smooth (punctate in P. punctata), without sporopollenin. Cells uninucleate; single chloroplast parietal and band shaped with single pyrenoid often becoming double in old cultures. Pyrenoid not traversed by thylakoids and with distinct starch sheath. Asexual reproduction by biflagellate zoospores; sporangial release by longitudinal tear in lateral wall. Zoospores 7.6-12.2 µm long, with anterior contractile vacuoles, parietal chloroplast, some spores with short anterior projection between flagella. Zoospores of P. antillarum without stigma, not phototactic. Akinetes formed by enlargement of main part of cell to form large spherical body to 35 µm diameter with polar appendages. On germination akinetes release zoospores. Sexual reproduction unknown. Pseudoschroderia planktonic in freshwater; reported from Europe, India and North America but likely cosmopolitan. Genus distinguished from Schroderia based on cell wall structure and heteropolarity. Genus assigned to subfamily Schroederioideae. Species distinguished based on cell size and shape and details of cell wall features.

Information contributed by: D. Gargary & T. Kalina. The most recent alteration to this page was made on 2012-01-27 by M.D. Guiry.

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

Most recent taxonomic treatment adopted: Tsarenko, P.M. (2011). Sphaeropleales. In: Algae of Ukraine: diversity, nomenclature, taxonomy, ecology and geography. Volume 3: Chlorophyta. (Tsarenko, P.M., Wasser, S.P. & Nevo, E. Eds), pp. 280-355. Ruggell: A.R.A. Gantner Verlag K.-G..

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=44587

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 27 January 2012. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 24 November 2024