Stylosphaeridium Geitler & Gimesi, 1925
Holotype species: Stylosphaeridium stipitatum (H.Bachmann) Geitler & Gimesi
Original publication and holotype designation: Geitler, L. (1925). Beiträge zur Kenntnis der Flora ostholsteinischer Seen. Archiv für Protistenkunde 52: 603-611, 4 figures.
Request PDFDescription: Thalli unicellular but often gregarious, comprised of spherical to ovoid cells with apical end towards substratum, attached by long narrow stipe to 20 µm long. Cells spherical to ovoid, often narrowing to point at base, 4-13 x 4-10 µm with apical end downward. Cells with smooth cell walls, with or without stigma but with one or two anterior contractile vacuoles. Cells with anterior nucleus; single chloroplast posterior or lateral, cup-shaped and parietal, with single pyrenoid. Asexual reproduction by biflagellate zoospores; 2, 4, or 8 per spoangium and ellipsoid, egg-shaped or elongate, often with pointed anterior. Zoospores 7-10 µm long, attache to substratum by anterior end. Sexual reproduction apparently known in one species but poorly described. Stylosphaeridium in freshwater, epiphytic and epizoic on planktonic organisms especially mucilaginous cyanobacteria; reported from Europe and North America, although only S. stipitatum known from North America. Taxonomic affinities unclear though genus differ from Stylosphaeridiella only by presence of biflagellate cells. Species of genus distinguisghed by differences in cell size and shape, presence or absence of stigmata, details of chloroplast morphology and host identity.
Information contributed by: D. Garbary. The most recent alteration to this page was made on 2023-07-25 by E.A. Molinari Novoa.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Gender: This genus name is currently treated as neuter.
Most recent taxonomic treatment adopted: Pentecost, A. (2011). Phylum Chlorophyta. Order Tetrasporales. In: The freshwater algal flora of the British Isles. An identification guide to freshwater and terrestrial algae. Second edition. (John, D.M., Whitton, B.A. & Brook, A.J. Eds), pp. 376-380. Cambridge: Cambridge University Press.
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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera,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=44221
Citing AlgaeBase
Cite this record as:
E.A. Molinari Novoa in Guiry, M.D. & Guiry, G.M. 25 July 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 26 April 2024
