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Phylum: Charophyta   Family: Desmidiaceae

Cosmarium klebsii cf.  Gutwinski

Identical to the nominate species except for having 2 pyrenoids per semi-cell. Not an unknown phenomenon but unusual. It has been separated pending ongoing research

Koos Meesters

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