B.  Edwards, Aptroot, A., Hawksworth, D. L., and James, P. W., ?Lecanora Ach. in Luyken (1809)?, in Lichens of Great Britain and Ireland, London: British Lichen Society, 2009, pp. 465-502.

B.  Edwards, Aptroot, A., Hawksworth, D. L., and James, P. W., ?Lecanora?, in Lichens of Great Britain and Ireland, London: British Lichen Society, 2009, pp. 465-502.