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.
This weakly parasitic or saprotrophic species grows mainly on the wounds and knotholes of old, living and dead trunks of deciduous trees. Here, it often grows high up on its host trees which are usually Beech Fagus sylvatica and more rarely on Oak Quercus spp. A very rare species which is virtually confined to old deciduous woodland in southern and south-western England. In Cornwall there has only ever been one record for this species, by a former recorder for Cornwall, in the Tresillian area (near Truro) in 1983. This species is a UK BAP List Priority Species which is internationally threatened.
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.