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Phylum: Charophyta   Family: Desmidiaceae

Cosmarium punctulatum var. subpunctulatum  (Nordstedt) Børgesen

From moorland pools and bogs, acidic or neutral. Differs from the nominate variety by having a central ring of granules to each semicell

Chris Johnson

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