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Ryan, BD/ Nash, TH, III 1991: Lecanora Sect. Petrasterion (lichenized Ascomycotina) in North America: Notes on the L. novomexicana complex (Subsect. Pseudocorticatae). - Mycotaxon 41(1): 57-65. [RLL List #  / Rec.# 16051]
Abstract: 4 figures [Two species are recognized in North America.]

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