Phylum: Chlorophyta Family: Oedogoniaceae
Oedogonium undulatum A. Braun ex Hirn 1900
A rare filamentous alga that was historically quite widely recorded. It prefers an acidic freshwater habitat.
References:
ohn, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition) The Freshwater Algal Flora of the British Isles.