Phylum: Charophyta   Family: Desmidiaceae

Staurastrum reductum (Messikommer) Coesel 2007

A biradiate species first described as a variety of Staurastrum dimazum by Messikommer (1927). It was later raised to species level by Coesel (2007). Found in the plankton of mesotrophic waters. Infrequently recorded and with an unknown distribution in the Outer hebrides.

References: 
Messikommer, E. (1927) Beiträge zur Kenntnis der Algenflora des Kantons Zürich II. Die Algenvegetation des Böndlerstück
Coesel, P.F.M. (2007) Taxonomic notes on Dutch desmids IV: new species, new names, new combinations