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Lücking, Robert; Tehler, Anders; Bungartz, Frank; Rivas Plata, Eimy; Lumbsch, H. Thorsten (2013). "Journey from the West: Did tropical Graphidaceae (lichenized Ascomycota: Ostropales) evolve from a saxicolous ancestor along the American Pacific coast?". American Journal of Botany. 100 (5): 844–856. doi:10.3732/ajb.1200548. PMID23594913.