| Name | Notes |
|---|---|
| no common name | Ralfsia verrucosa (ralfsiaceae) |
| Key criteria: | Plants crustose epilithic or epizoic especially on limpets forming discrete or more usually confluent firm and coriaceous patches in intertidal pools and exposed. Usually common and abundant on most shores. epilithic epizoic intertidal exposed pool |
A Check-list and Atlas of the Seaweeds of Britain and Ireland. F. G. Hardy and M. D. Guiry. The British Phycological Society, 2003. ISBN 0 9527115 16 Seaweeds of Britain and Ireland. Bunker, Brodie, Maggs and Bunker. Seasearch 2012.