colonial animals growing on kelp
No interactions present.
hum I am not sure but I think this might be the Sea Mat Membranipora membranacea rather than the frosty sea mat it doesn't look quite sharp enough around the edges to be the frosty sea mat. Have a look at the marine life information network bryzoan pages at
www.marlin.ac.uk/phylumdetails.php?phylum=2432 however their photo of the frosty seamat isn't ideal I found a better selection at the following site: www.seawater.no/fauna/Mosdyr/pilosa.htm I had a look at the image in dive mgazine and I agree that it looks similar to yours I dont think their picture is frosty sea mat either! However bryozoans are always difficult to ID insitu!
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I have seen a lot of sea mat which is Membranipora membranacea and it seems to have a slight ' border' as an edge. I felt this was different but not sure. Will be something to look more closely at in future. This was my first time with underwater camera and was perhaps concentrating on photo and not identification. Saw a chiton as well but it did not come out. Many thanks for your comments Ann
Lat/Lng: 53.196582192278, -6.0905939340591
OS grid ref: SG268744
Visible at low water. Would be exposed when low water springs