Phylum: Charophyta Family: Desmidiaceae
Staurodesmus aristiferus (Ralfs) Tomasson
A rare species found in the plankton of acidic waters. It has a western (Atlantic) distribution in Britain
References:
Ralfs, J. (1848) The British Desmidieae
Coesel, P.F.M. & Meesters, K.J. (2013) European Flora of the Desmid Genera Staurastrum and Staurodesmus
Tsarenko, P.M., Wasser, S.P. & Nevo, E. editors (2014) Algae of Ukraine, Volume 4: Charophyta