Phylum: Charophyta Family: Desmidiaceae
Staurodesmus mucronatus var. subtriangularis (West & G.S. West) Croasdale
Described as common on the continent but lacking data for Britain. Current finds have been in acidic lochside vegetation
References:
Coesel, P.F.M. & Meesters, K.J. (2013) European Flora of the Desmid Genera Staurastrum and Staurodesmus