The descriptive text, below the map, is from the Cornish Red Data Book (2009). The map on this web page depicts the organisms distribution and shows the records made pre-2000 and those made since.
Range & Status
A large species with branched, spongy ' fingers' , growing on bedrock, mostly in the subtidal zone. Confined to south-western shores in Britain and the southern and western shores of Ireland. Apart from Cornwall and the Isles of Scilly it has been reported from Devon, Dorset, the Isle of Wight and Jersey in the Channel Islands. It extends south along the Atlantic coast of Europe to the Mediterranean and Adriatic Seas also the northern and western coasts of Africa.
I.J. Bennallick, S. Board, C.N. French, P.A. Gainey, C. Neil, R. Parslow, A. Spalding and P.E. Tompsett. eds. 2009. Red Data Book for Cornwall and the Isles of Scilly. 2nd Edition.Croceago Press.
The Cornish Red Data Book Project was led by the Cornwall and Isles of Scilly Federation for Biological Recorders (CISFBR). The full text and species accounts (minus the maps) are available on the CISFBR website.