Phylum: Charophyta   Family: Desmidiaceae

Euastrum inerme (Ralfs) P.Lundell 1871

An acidophile of boggy habitats and shallow vegetated lochs. A Europe-wide rare species but, interestingly, the Wests (1905) say "… but often occurs in great abundance in the west of Scotland, the Outer Hebrides, and the west of Ireland." Recent studies suggest this is no longer the case.

References: 
Ralfs, J. (1848) The British Desmidieae
West, W. & West, G.S. (1905) A Monograph of the British Desmidiaceae, Volume 2
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands