V.  Giavarini, Purvis, O. W., and James, P. W., ?Chaenotheca?, in Lichens of Great Britain and Ireland, London: British Lichen Society, 2009, pp. 297-303.

V.  Giavarini and Purvis, O. W., ?Sclerophora?, in Lichens of Great Britain & Ireland, London: British Lichen Society, 2009.