@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.} }