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Phylum: Charophyta   Family: Desmidiaceae

Cosmarium crenatum   Ralfs ex Ralfs

Found on wet rocks and shallow depressions in water with a pH either side of neutral. Described as an alpine and arctic desmid, there can be three or four crenations at each side of the semicell and four at the apex

Determiner: 
Koos Meesters (first image)
Chris Johnson (others)

References: 
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

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