Phylum: Cyanobacteria   Family: Oscillatoriaceae

Oscillatoria corallinae Gomont ex Gomont

These microscopic algae are rarely looked at and hence under-recorded. Trichomes can be green, blue or pale brown and densely intertwined. Thought to be mainly epiphytic on seaweeds

References: 
Newton, L. (1931) - A Handbook of the British Seaweeds
John, D.M., Whitton, B.A. & Brook, A.J. (2011) - The Freshwater Algal Flora of the British Isles