@article {2483,
	title = {Key to European Usnea species},
	journal = {Bibliotheca Lichenologica},
	volume = {100},
	year = {2009},
	pages = {419-462},
	url = {http://home.comcast.net/~nwlichens/Randlane_et\%20al_2009Usnea.pdf},
	author = {Randlane, T. and T{\~o}rra, T. and Saag, A. and Saag, L.}
}
@article {2474,
	title = {Phylogenetic relations of European shrubby taxa of the genus Usnea},
	journal = {Lichenologist},
	volume = {43},
	year = {2011},
	pages = {427-444},
	issn = {0024-2829},
	doi = {10.1017/S0024282911000375},
	author = {Saag, L. and T{\~o}rra, T. and Saag, A. and Del-Prado, R. and Randlane, T.}
}
