@inbook {4146,
	title = {Calicium},
	booktitle = {Lichens of Great Britain and Ireland},
	year = {2009},
	pages = {241-245},
	publisher = {British Lichen Society},
	organization = {British Lichen Society},
	address = {London},
	isbn = {9780954041885},
	author = {Giavarini, V.J. and Purvis, O.W.}
}
