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Phylum: Charophyta   Family: Desmidiaceae

Staurodesmus convergens  (Ehrenberg ex Ralfs) S. Lillieroth

Common in shallow, slightly acid, mesotrophic water. The length of the spines varies considerably and the cell-shape alters accordingly

Chris Johnson

Coesel & Meesters (2013) European Flora of the Desmid Genera Staurastrum and Staurodesmus
John, Whitton & Brook (2011) The Freshwater Algal Flora of the British Isles