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Phylum: Charophyta   Family: Desmidiaceae

Cosmarium pericymatium  Nordstedt

A scarce species of ephemeral pools and structures such as birdbaths. West & West (1908) describe it as unknown in Britain

Chris Johnson

Coesel & Meesters (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands
John, Whitton & Brook (2011) The Freshwater Algal Flora of the British Isles
West & West (1908) A Monograph of the British Desmidiaceae, Volume 3