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Phylum: Charophyta   Family: Desmidiaceae

Staurastrum margaritaceum  Menegh. ex Ralfs

Widespread in marginal vegetation of lochs and in Sphagnum bogs. Quite variable in the number of radial processes, with 4–6 being usual

Koos Meesters (first two images)
Chris Johnson (others)

Coesel & Meesters (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands
John, Whitton & Brook (2011) The Freshwater Algal Flora of the British Isles
West & West (1904-23) A Monograph of the British Desmidiaceae