Phylum: Ochrophyta   Family: Chromulinaceae

Uroglenopsis americana (G.N.Calkins) Lemmermann

Infrequently recorded and of uncertain distribution. Planktonic in lochs and large ponds

References: 
John, D.M., Whitton, B.A. & Brook, A.J. (2011) The Freshwater Algal Flora of the British Isles