Phylum: Chlorophyta Family: Radiococcaceae
Radiococcus polycoccus (Korshikov) Kostikov, Darienko, Lukesová & L. Hoffmann
This has undergone a number of name-changes in recent times. Thought to be widespread in shallow pools and loch-margins
References:
John, Whitton & Brook (2011 second edition) The Freshwater Algal Flora of the British Isles