Phylum: Charophyta   Family: Desmidiaceae

Staurastrum dispar Brébisson

Very similar to Staurastrum striatum but with the cells more fusiform. Found in mesotrophic waters. Status unclear because of possible misidentifications but thought to be fairly common.

References: 
Coesel, P.F.M. & Meesters, K.J. (2013) European Flora of the Desmid Genera Staurastrum and Staurodesmus