Phylum: Chlorophyta Family: Selenestraceae
Ankistrodesmus falcatus (Corda) Ralfs
Widespead in acidic habitats including plaktonic and with detritus
References:
John, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition) The Freshwater Algal Flora of the British Isles
Ralfs, J. (1848) The British Desmidieae