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
The species occurs in SW. Britain (Cornwall, Devon and Pembrokeshire), Channel Isles, SW. Europe (Brittany, Portugal, Spain) and on the Atlantic coast of Morocco. In Britain it is recorded from 56 10 km grid squares. A significant percentage of the populations occur in Cornwall where it is widely distributed (32 10 km grid squares) on the coastal cliffs. In Britain this species is typically associated with low patchy vegetation on coastal cliffs over acidic rocks. However, it is also known at inland sites on china-clay spoil in East Cornwall (Holyoak, 2000a). Although there are a large number of sites on the coasts of Cornwall and the Isles of Scilly there is a potential threat to the open coastal habitats from development and especially from long-term scrub encroachment and habitat loss due to lack of grazing.
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.