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Phylum: Charophyta   Family: Closteriaceae

Closterium toxon  West

Considered by Brook & Williamson (2010: 243) to be a 'taxon of doubtful validity'. However, it is still listed as a valid species and the specimen to hand seems to fit the criteria (subject to peer review)

Chris Johnson

Brooks & Williamson (2010) A Monograph on some British Desmids
Coesel & Meesters (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands
West & West (1904-23) A Monograph of the British Desmidiaceae