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 rare species found on old trees, especially Beech Fagus sylvatica and Oak Quercus spp. especially in ancient woodland. It has also been recorded growing on shaded vertical granite rock faces in west Cornwall. Also in west Cornwall it has been found with apothecia growing on Willow Salix spp. More recently Giavarini (2002) has found flourishing populations on Gorse Ulex spp. scrub during survey work at several metalliferous mining sites. Elsewhere it is known from western Europe and Macronesia. Whereas this species does not appear to have any immediate threats at its old woodland sites, those populations on Gorse on metalliferous mine sites may be at threat from fire and landscaping activity.
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.