Phylum: Charophyta   Family: Desmidiaceae

Staurastrum striatum (W. & G.S. West) J. Ruzicka 1957

Very similar to Staurastrum dispar but with the cells less fusiform, and the angles slightly less acute. Some cells are difficult to separate, and they both occupy the same habitat types.
Cell dimensions: L: 25-37 µm; B: 23-36 µm; Is: 8.5-12.5 µm.
Found in circumneutral waters but infrequently found in the Outer Hebrides.

References: 
Coesel, P.F.M. & Meesters, K.J. (2013). European Flora of the Desmid Genera Staurastrum and Staurodesmus.
Van Westen, M.C. (2024). Sieralgen in Drenthe.