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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

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

References: 
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

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