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 foliose to subfruticose lichen that prefers nutrient enriched bark of mature trees,
especially Elm Ulmus spp., Ash Fraxinus excelsior and Sycamore Acer pseudoplatanus , in well-lit situations. Formerly common (though not in Cornwall, a high rainfall area), this species has undergone a dramatic decline in recent years from a combination of sulphur dioxide air pollution, excessive use of fertilisers and loss of suitable hedgerow, parkland and wayside trees. There is only one recent Cornish record, on Ash, in East 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.