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Phylum: Charophyta   Family: Desmidiaceae

Cosmarium capitulum  J. Roy & Bisset

No data to hand but thought to be rare. Found with lochside vegetation in mildly acidic waters. A distinct shape with pronounced, rounded, lateral margins

Chris Johnson

Coesel & Meesters (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands
West & West (1904-23) A Monograph of the British Desmidiaceae