@book {727,
	title = {Lichen Flora of Great Britain and Ireland},
	year = {1992},
	pages = {710},
	publisher = {The Natural History Museum},
	organization = {The Natural History Museum},
	address = {London},
	author = {Purvis, O.W. and Coppins, B.J. and Hawksworth, D.L. and James, P. and Moore, D.M.}
}
