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...really need to qualify this with hand lens observations -
did it have tower cells?
were there blunt bristles at the end of each zooid?
did it feel chalky?
Having said all that you are probably right as a) encrusting b) looks like it's habitat is on a laminaria shaft?
It could still be one of the Electra species.
Here in North-east Kent we tend to get Electra pilosa - hairy sea-mat (again tend to be on laminarians) - these have spines at one end.
Thank you for your info.
It was encrusted on laminaria quite extensively. It didn't look like it had any sort of spines.
I plan to go back to this location soo, so I will take a sample and take photos through the microscope. I'll post them here.
Sara Garcia Hipolito
Lat/Lng: 54.2653, -8.6148
OS grid ref: NU695057
Found on Kelp in Strandhill Beach