Phylum: Charophyta Family: Desmidiaceae
Staurastrum simonyi Heimerl 1891
Widespread in Britain but not common. Found in acidic moorland pools and peat bogs, often in benthic debris.
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.
West, W., West, G.S. & Carter, N. (1923) A Monograph of the British Desmidiaceae, Volume 5.