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 small, foliose species which is epilithic on bedrock, epiphytic on small algae or epizoic on sessile invertebrates in the subtidal zone to 15m and deep, shaded, lower shore pools of wave-exposed coasts. Only known from two British localities, north Devon and the Isles of Scilly. It is also known from western Ireland and the Channel Isles. This is a truly rare south-western and western species.
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.