Holotype species: Radiococcus nimbatus (De Wildeman) Schmidle
Original publication and holotype designation: Schmidle, W. (1902). Ueber die Gattung Radiococcus Schmidle n. gen. Allgemeine botanische Zeitschrift für Systematik, Floristik, Pflanzengeographie 8: 41-42.
Taxonomic status: currently recognized as a distinct genus.
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..
Description: Colonial, free-floating algae with typically up to 16 globular cells immersed in thick mucilaginous envelope to 250 &m diameter, with or without radially aligned striations in mucilage. Cells 3-15 &m diameter, mostly with smooth cell walls, occasionally with several verrucose outgrowths. Cells often tetrahedrally arranged, though occasionally in rings or dispersed. Cells uninucleate; chloroplast single and parietal, with single pyrenoid. Asexual reproduction by autospores; (4-) 8 per sporangium; release accompanied by fragmentation of parental cell wall into as many fragments as spores produced. Cell wall fragments remaining distinct in mucilage for some time before being dissolved. Flagellated stages and sexual reproduction unknown. Radiococcus planktonic in freshwater; reported from Europe and North America, probably more widely distributed. Species distinguished based on colony shape and cell size; one species, R. subcylindricus apparently without pyrenoids. Genus similar to Korschpalmella which does not have pyrenoids.
Information contributed by: D. Garbary & A. Comas. The most recent alteration to this page was made on 2 Sep 2014 by M.D. Guiry.
Numbers of names and species: There are 18 species names in the database at present, of which 6 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..
Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):
Click here to also show infraspecific names in the list below.
Cambra Sánchez, J., Álvarez Cobelas, M. & Aboal Sanjurjo, M. (1998). Lista florística y bibliográfica de los clorófitos (Chlorophyta) de la Península Ibérica, Islas Baleares e Islas Canarias. pp. 1-614. Burgos: Asociación Española de Limnología.
Wolf, M., Hepperle, D. & Krienitz, L. (2003). On the phylogeny of Radiococcus, Planktosphaeria and Schizochlamydella (Radiococcaceae, Chlorophyta). Biologia, Bratislava 58(4): 759-765, 3 figs.
Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
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.
Created: 23 April 2002 by M.D. Guiry
Verified by: 02 September 2014 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=44271
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 26 February 2020.