Phylum: Charophyta Family: Desmidiaceae
Staurastrum forficulatum var. verrucosum Grönblad 1920
Coesel & Meesters (2013) describe it as 'widely distributed and locally rather common, particularly in boreal and (sub)alpine regions.' There is little data for the Outer Hebrides
References:
Grönblad, R. (1920) Finnländische Desmidiaceen aus Keuru.
Coesel, P.F.M. & Meesters, K.J. (2013) European Flora of the Desmid Genera Staurastrum and Staurodesmus.