Phylum: Ochrophyta   Family: Scytosiphonaceae

Symphyocarpus strangulans Rosenvinge, 1893

A small thallus (up to 5 mm) found on laminaria and also epizoic in the sublittoral. Newton describes it growing on Chaetomorpha melagonium. Rarely recorded

References: 
Newton (1931) H10- A Handbook of the British Seaweeds;
Fletcher - Seaweeds of the British Isles, Volume 3 Fucophyceae (Phaeophyceae), Part 1