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Phylum: Charophyta   Family: Desmidiaceaea

Cosmarium tetraophthalmum  Br√©bisson ex Ralfs

West & West (1908) note 'Very common in the Outer Hebrides... is found generally distributed over the whole of the British Islands, but more especially in Sphagnum-bogs and in peaty moorland ditches'

Chris Johnson

Ralfs, J. (1848) The British Desmidieae
West, W. & West, G.S. (1908) A Monograph of the British Desmidiaceae, Volume 3
John, D.M. & Williamson, D.B. (2009) A Practical Guide to the Desmids of the West of Ireland
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands