Found in rockpools and also washed up on upper shore
No interactions present.
Good photo showing the reproductive bodies, called cystocarps, which occur as oval shaped swellings along the sides of the branches. Furcellaria lumbricalis is similar, but its reproductive bodies occur as pod-like structures at the ends of the branches. See http://www.marlin.ac.uk/speciesinformation.php?speciesID=4168
Lat/Lng: 51.3794, 1.1973
OS grid ref: TR225693