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
Syn. P. rupestris (Draparnaud). A widespread species in Britain which is characteristic of limestone rocks and walls; not threatened. The Cornish records are all from artificial habitats on mortared walls and garden ornaments: at Restormel Castle (SX16A), Portwrinkle (SX35L), Mount Edgcumbe (SX45L) and Millbrook village (SX45G).
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.