Found growing in rock pools on the upper shore and on rocks at all levels of the shore; some found growing on Toothed wrack
No interactions present.
There are a number of tubular species of Ulva that can be difficult to separate in images. Best to have a look at the Seasearch Guide to seaweeds by Bunker at al. to separate them out
Lat/Lng: 50.3613, -4.1594
OS grid ref: SX465534
Shingle beach on a rocky shore at Eastern King, Stonehouse, Plymouth