Ryan, BD/ Nash, TH, III 1991: Lecanora Sect. Petrasterion (lichenized Ascomycotina) in North America: Notes on the L. novomexicana complex (Subsect. Pseudocorticatae). - Mycotaxon41(1): 57-65. [RLL List # / Rec.# 16051] Keywords: LECANORA/ NORTH AMERICA
Abstract: 4 figures [Two species are recognized in North America.]