Phylum: Charophyta   Family: Desmidiaceae

Staurastrum vestitum Ralfs 1848

Found in slightly acidic habitats such as shallow lochs and moorland ponds. Also found in more acidic waters with Sphagnum. Possibly widespread in the Outer Hebrides but not common.

References: 
Coesel, P.F.M. & Meesters, K.J. (2013) European Flora of the Desmid Genera Staurastrum and Staurodesmus.
John, D.M. & Williamson, D.B. (2009) A Practical Guide to the Desmids of the West of Ireland.
Ralfs, J. (1848) The British Desmidieae.