@article {1352,
	title = {Eine Revision der Flechtenfamilien Lichinaceae und Ephebaceae},
	journal = {Symbolae Botanicae Upsalienses},
	volume = {18},
	number = {1},
	year = {1963},
	author = {Aino Henssen}
}
@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 {1433,
	title = {Foliicolous lichens I. A revision of the taxonomy of the obligately foliicolous, lichenized fungi},
	series = {Symbolae Botanicae Upsalienses},
	volume = {12},
	year = {1952},
	pages = {590},
	edition = {1},
	address = {Uppsala},
	author = {Rolf Santesson}
}
