@book {897,
	title = {The lichen genus Collema with special reference to the extra-European species.},
	series = {Symb. Bot. Upsaliensis},
	volume = {20},
	number = {20},
	year = {1974},
	pages = {215},
	publisher = {University of Uppsala},
	organization = {University of Uppsala},
	address = {Uppsala},
	author = {Degelius, G.}
}
