Sorastrum Kützing, 1845

Holotype species: Sorastrum echinatum (Meneghini) Kützing

Original publication and holotype designation: Kützing, F.T. (1845). Phycologia germanica, d. i. Deutschlands Algen in bündigen Beschreibungen. Nebst einer Anleitung zum Untersuchen und Bestimmen dieser Gewächse für Anfänger. pp. [i]-x, [1]-340 ['240']. Nordhausen: zu finden bei Wilh. Köhne.

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Description: Thalli spherical colonies to 60 &m diameter, consisting of 8-128 cells radiating from center of coenobium. Cells to 20 &m in maximum dimension, pyriform, semilunar or reniform with one, two or four stout spines on the outer face. Cells with gelatinous stalks on inner face of each cell, these join in center of coenobium forming faceted sphere. Adult cells multinucleate; chloroplast single and parietal, generally covering most of wall; pyrenoid single. Asexual reproduction, studied in detail in S. spinulosum, by biflagellate zoospores produced by repeated, synchronous division of protoplast. Zoospores released in a vesicle from parental cells via tear in cell wall. Vesicle derived from inner wall layer of sporangial wall. Bands of microtubules in zoospores at sites of cohesion during. After free-swimming stage zoospores aggregate with apical ends facing inwards. In culture, single vesicle may produce more than one new coenobium. Sexual reproduction unknown, presumably similar to Pediastrum and Hydrodictyon. Sorastrum planktonic, often found in collections from permanent or semipermanent pools but rarer than other Hydrodictyaceae. Genus basically cosmopolitan in temperate to tropical climates. Species distinguished mostly on cell size and shape and morphology of cell wall processes. In culture, five-spined spherical unicells produced that resemble some Tetraedron spp. and life history stages of other genera. Unicells produce additional generations of unicellular and/or colonial thalli.

Information contributed by: D. Garbary & T. Harper. 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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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.

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 27 January 2012. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 16 April 2024

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