@article {899, title = {A cumulative checklist of the lichen-forming, lichenicolous and allied fungi of the continental United States and Canada.}, year = {2011}, note = {First posted 1 December 1997, most recent update 2 April 2007.}, month = {16 May 2011}, url = {http://www.ndsu.edu/pubweb/~esslinge/chcklst/chcklst7.htm}, author = {Esslinger, T. L.} }