Phylum: Charophyta   Family: Desmidiaceae

Staurodesmus dickiei (Ralfs) S.Lillieroth

Widespread in circumneutral waters such as bogs, pools and ditches

References: 
Coesel, P.F.M. & Meesters, K.J. (2013) European Flora of the Desmid Genera Staurastrum and Staurodesmus
John, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition) The Freshwater Algal Flora of the British Isles
Ralfs, J. (1848) The British Desmidieae