R. G.  Woods and Coppins, B. J., A Conservation Evaluation of British Lichens and Lichenicolous Fungi. Species Status 13, 2nd editionnd ed. Peterborough, UK: Joint Nature Conservation Committee, 2012, p. 155.

R. G.  Woods and Coppins, B. J., ?A conservation evaluation of British lichens and lichenicolous fungi?, JNCC Species Status Publication, vol. 13, p. 155 pp, 2012.