Found growing along the lower shore
No interactions present.
There are a lot of other species too.
another species of Ulva , perhaps U intestinalis
Yes, Mike has it right, above.
but lactuca requires a cell examonation to absolutely certain.
I don't thing it is U.intestinalis
I thinks it's fine to call this Sea Lettuce.
THREE MARINE PROJECTS
Lat/Lng: 50.3613, -4.1594
OS grid ref: SX465534
Shingle beach on a rocky shore at Eastern King, Stonehouse, Plymouth