Phylum: Charophyta Family: Desmidiaceae
Cosmarium botrytis Meneghini ex Ralfs 1848
Rather common in slightly acidic to slightly alkaline waters, found in the plankton and marginal vegetation of lochs, and from ephemeral pools. It should be compared closely with Cosmarium ochthodes.
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. (1912) A Monograph of the British Desmidiaceae, Volume 4.