Phylum: Rhodophyta   Family: Wrangeliaceae

Spermothamnion repens  (Dillwyn) Rosenvinge, 1924

A widespread species but infrequently recorded. Epiphytic on various algae, also on hard surfaces

References: 
Maggs & Hommersand (1993) - Seaweeds of the British Isles, Volume 1 Rhodophyta, Part 3A Ceramiales