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
This species is recorded in Britain, France, Belgium and Germany. In Britain it is reported from 69 10 km grid squares and it is thought to be a declining species, where isolated habitats are at risk from felling or replanting with conifers. In Cornwall there are two sites: in SX37W near Luckett and SX46J at Cotehele Wood. P. major is a useful indicator of primary woodland which is a relatively uncommon habitat in Cornwall.
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.