@article {2492,
	title = {Ribosomal DNA and beta-tubulin data do not support the separation of the lichens Usnea florida and U. subfloridana as distinct specie},
	journal = {Mycological Research},
	volume = {106},
	year = {2002},
	pages = {412-418},
	doi = {10.1017/S0953756202005},
	author = {Articus, K. and Mattson, J.-E. and Tibell, L. and Grube, M. and Wedin, M.}
}
