@article {1191,
	title = {The Lichen Genus Collema in Europe},
	journal = {Symbolae Botanicae upsalienses},
	volume = {13},
	number = {2},
	year = {1954},
	pages = {1-499},
	author = {Degelius, Gunnar}
}
@book {52,
	title = {The Lichen Genus Collema with Special Reference to the Extra-European Species},
	year = {1974},
	publisher = {ofters tryckeri ab, {\"O}stervala},
	organization = {ofters tryckeri ab, {\"O}stervala},
	address = {Stockholm},
	issn = {91-554-0250-x},
	author = {Degelius, Gunnar}
}
