@inbook {4469,
	title = {Porpidia},
	booktitle = {Lichens of Great Britain and Ireland},
	year = {2009},
	pages = {739-749},
	publisher = {British Lichen Society},
	organization = {British Lichen Society},
	address = {London},
	author = {Fryday, A.M. and Gilbert, O.L. and Galloway, D.J. and Coppins, B.J.}
}
