Phylum: Charophyta Family: Desmidiaceae
Cosmarium ornatum Ralfs ex Ralfs
Widespread in Britain especially in moorland bogs and disused peat-cuttings
References:
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands
John, D.M. & Williamson, D.B. (2009) A Practical Guide to the Desmids of the West of Ireland
West, W. & West, G.S. (1908) A Monograph of the British Desmidiaceae, Volume 3