@book {931,
	title = {The Lichen Flora of Great Britain and Ireland.},
	year = {1992},
	pages = {710},
	publisher = {Natural History Museum Publications \& British Lichen Society},
	organization = {Natural History Museum Publications \& British Lichen Society},
	address = {London},
	author = {Purvis, O. W. and Coppins, B. J. and Hawksworth, D. L. and James, P. W. and Moore, D. M.}
}
