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Ryan, BD/ Nash, TH", III 1989: Lecanora sect. Petrasterion (lichenized Ascomycotina) in North America: Lecanora sonorae Ryan & Nash, sp. nov. (subsect. Pseudocorticatae), from Mexico. - Cryptogamic Botany 1: 215-218. [RLL List # 140 / Rec.# 16049]
Abstract: 1 plate. [New: Lecanora sonorae sp. nov. from Sonora and Oaxaca, Mexico.]

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