Phylum: Rhodophyta   Family: Rhodomelaceae

Osmundea osmunda (S.G. Gmelin) K.W. Nam & Maggs, 1994

Royal Fern Weed

It differs from Osmundea pinnatifida in occupying the lower intertidal zone, is more branched and has a flatter stipe and branches. Less often recorded

References: 
Newton (1931) - A Handbook of the British Seaweeds;
Maggs & Hommersand (1993) - Seaweeds of the British Isles, Volume 1 Rhodophyta, Part 3A Ceramiales