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.
A species that prefers a well-lit, freely draining consolidated basic substrate. It is locally frequent adjacent to sand dunes along the north Cornish coastline (e.g. Perranporth and Rock) where it seems to be associated with the moss Trichostomium crispulum . Elsewhere it is known from north Devon, Breckland, (extinct) the Isle of Wight, south Wales and the Channel Islands. An estimated 50 \endash 60% of the British population occurs on the dunes at Perranporth.
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.