Phylum: Cyanobacteria Family: Aphanothecaceae
Aphanothece stagnina (Sprengel) A. Braun
A common constituent of shallow turgid waters, usually slightly acidic
References:
John, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition) The Freshwater Algal Flora of the British Isles