{{Short description|Genus of algae}} {{Automatic taxobox | taxon = Radiococcus | authority = Schmidle, 1902 | image = Radiococcus nimbatus as Pleurococcus nimbatus in Wildeman 1893.jpg | image_caption = ''Radiococcus nimbatus'' | subdivision_ranks = Species | subdivision = * ''Radiococcus bavaricus'' * ''Radiococcus bilobatus'' * ''Radiococcus nimbatus'' * ''Radiococcus planktonicus'' * ''Radiococcus polycoccus'' * ''Radiococcus signiensis'' * ''Radiococcus sphaericus'' * ''Radiococcus wildemannii'' | subdivision_ref = <ref name=AlgaeBase/> | type_species = Radiococcus nimbatus | type_species_authority = (De Wildeman) Schmidle<ref name=AlgaeBase>{{AlgaeBase genus | id=44271 | title=''Radiococcus'' Schmidle, 1902 | access-date=2026-04-28 }}</ref> }}

'''''Radiococcus''''' is a genus of green algae in the family Radiococcaceae.<ref>See the NCBI [https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&id=245902 webpage on Radiococcus]. Data extracted from the {{cite web | url=https://ftp.ncbi.nih.gov/pub/taxonomy/ | title=NCBI taxonomy resources | publisher=National Center for Biotechnology Information | access-date=2007-03-19}}</ref> It is found in the plankton of freshwater habitats.<ref name=AlgaeBase/>

''Radiococcus'' consists of colonies of cells embedded in a mucilage; the mucilage may have radial striations. Cells are 3–15 &mu;m in diameter, often grouped into tetrads or arranged in a ring. The cell walls are mostly smooth, although in some species they may be warty (verrucose). Cells have a single nucleus and a single parietal chloroplast with one pyrenoid.<ref name=AlgaeBase/>

''Radiococcus'' reproduces asexually via the formation of autospores. Four to eight autospores are produced per sporangium; they are released when the mother cell wall fragments. Cell wall fragments remain in the mucilage for some time before dissolving.<ref name=AlgaeBase/>

''Radiococcus'' is considered an ill-defined genus in need of taxonomic revision.<ref name=John2021>{{cite book|doi=10.1017/CHOL9781108784122 |title=The Freshwater Algal Flora of the British Isles |date=2021 |last1=John |first1=David M. |last2=Whitton |first2=Brian A. |last3=Brook |first3=Alan J. |isbn=978-1-108-78412-2 |edition=2|publisher= Cambridge University Press|pages=896}}</ref> It is similar to ''Planktosphaeria'', which has multiple chloroplasts per cell,<ref name=Kostikov>{{cite journal |last1=Kostikov |first1=I. |last2=Darienko |first2=T. |last3=Lukešová |first3=A. |last4=Hoffmann |first4=L. |year=2002 |title=Revision of the classification system of Radiococcaceae Fott ex Komárek (except the subfamily Dictyochlorelloideae) (Chlorophyta) |journal=Archiv für Hydrobiologie Supplement |volume=104 |pages=23–58}}</ref> and ''Korschpalmella'', which lacks pyrenoids.<ref name=AlgaeBase/>

==References== {{Reflist|1}}

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Category:Sphaeropleales genera Category:Sphaeropleales

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