Phylum: Charophyta   Family: Desmidiacea

Staurastrum bicorne P. Hauptfleisch 1888

First described and illustrated by Hauptfleisch (1888: 95, pl. 3: 21, 24, 27). Roy (1893: 179) recorded it as extremely rare, only finding it at the margins of Birsemore Loch, Aberdeen, Scotland.
Cell dimensions: L: 52-60 µm; B: 72-100 µm; Is: 10-13.4 µm.
Since Roy’s time this taxon remains extremely rare. An acidophile, found in moorland bogs and vegetated loch-margins.

References: 
Coesel, P.F.M. & Meesters, K.J. (2013) European Flora of the Desmid Genera Staurastrum and Staurodesmus.
Hauptfleish, P. (1888) Zellmembran und Hüllgalerte der Desmidiaceen.
Roy, J. (1893) On Scottish Desmidieae.
West, W., West, G.S. & Carter, N. (1923) A Monograph of the British Desmidiaceae, Volume 5.