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Phylum: Charophyta   Family: Desmidiaceae

Cosmarium klebsii  Gutwinski

The distribution is unclear as it's very similar to Cosmarium subtumidum; indeed, West & West have it as a variety of that species. The main differences are more widely rounded basal angles and more truncate apex

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 (1904-23) A Monograph of the British Desmidiaceae