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Cosmarium speciosum var. rostafinskii Desmid Species Outer Hebrides

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Phylum: Charophyta   Family: Desmidiaceae

Cosmarium speciosum var. rostafinskii  (Gutwinski) West & G.S. West

This variety is smaller that the type but is found in similar habitats. The type species is something of a complex with several named varieties. Kouwets (in manuscript) is proposing to synonymise most varieties as natural variation. Var. rostafinskii with be elevated to species level

References: 
Kouwets, F.A.C. (in manuscript) European Flora of the Desmid Genus Cosmarium
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands
Prescott, W.G., et al. (2001 reprint) A Synopsis of North American Desmids. Part II, Desmidiaceae: Placodermae, Section 3

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