P. L.  Nimis, The Lichens of Italy: An annotated catalogue, vol. 12. Torino: , 1993.

O.  Gilbert, Lichens. London: HarperCollins, 2000, p. 288.

P. M.  McCarthy, ?Checklist of the Lichens of Australia and its Island Territories?, Australian Biological Resources Study, Canberra., 2010.

?Index Fungorum [taxonomy information]?, 2008.