@inbook {4059,
	title = {Leptogium},
	booktitle = {Lichens of Great Britain and Ireland},
	year = {2009},
	pages = {541-551},
	publisher = {British Lichen Society},
	organization = {British Lichen Society},
	address = {London},
	author = {Gilbert, O.L. and J{\o}rgensen, P.M.}
}
@inbook {3733,
	title = {Collema},
	booktitle = {Lichens of Great Britain and Ireland},
	year = {2009},
	author = {Gilbert, O.L. and James, P.W. and Purvis, O.W.}
}
