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Phylum: Charophyta   Family: Desmidiaceaea

Staurastrum orbiculare  Meneghini ex Ralfs

Widespread throught Europe but not common. Tolerant of circumneutral waters. The specimen illustrated is at the small end of the scale but not unknown

Determiner: 
Chris Johnson

References: 
Coesel, P.F.M. & Meesters, K.J. (2013) European Flora of the Desmid Genera Staurastrum and Staurodesmus
West, W. & West, G.S. (1912) A Monograph of the British Desmidiaceae, Volume 4
John, D.M. & Williamson, D.B. (2009) A Practical Guide to the Desmids of the West of Ireland

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