@article {3326,
	title = {Studies on the lichens of the Azores. Part 4. The genus Heterodermia},
	journal = {Symbolae Botanicae Upsalienses},
	volume = {32},
	year = {1996},
	pages = {187-194},
	author = {Moberg, R. and Purvis, O.W.}
}
@inbook {3325,
	title = {Heterodermia},
	booktitle = {Lichens of Great Britain \& Ireland},
	year = {2009},
	publisher = {British Lichen Society},
	organization = {British Lichen Society},
	address = {London},
	author = {Edwards, B. and Purvis, O.W.}
}
@inbook {2489,
	title = {Rinodina},
	booktitle = {Lichens of Great Britain \& Ireland},
	year = {2009},
	pages = {812-825},
	publisher = {British Lichen Society},
	organization = {British Lichen Society},
	address = {London},
	author = {Giavarini, V. and James, P.W. and Purvis, O.W.}
}
