@article {4221, title = {The Buellia aethalea-group in the Greater Sonoran Desert Region with reference to similar species in North America}, journal = {Bryologist}, volume = {107}, year = {2004}, pages = {441-458}, issn = {0007-2745}, doi = {10.1639/0007-2745(2004)107[441:TBAITG]2.0.CO;2}, url = {http://www.bioone.org/doi/abs/10.1639/0007-2745\%282004\%29107\%5B441\%3ATBAITG\%5D2.0.CO\%3B2}, author = {Bungartz, F. and Nash, T.H.} }