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 (to 10cm), robust polysiphonous species confined to the subtidal zone and deep rock pools. It is difficult to distinguish from other Dasya spp. unless fertile, but it is also very rare. At the present time it is known from the Isles of Scilly, the north coasts of Devon and Cornwall, Dorset and the west coast of Ireland. There is evidence to suggest that it may have undergone decline in recent years.
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.