@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.}
}
@article {919,
	title = {The lichen genus Porina in Macaronesia with descriptions of two new species.},
	journal = {Lichenologist},
	volume = {39},
	year = {2007},
	pages = {15-33},
	author = {Serusiaux, E. and Berger, F. and Brand, M. and Coppins, B. J.}
}
