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The family Cudoniaceae (Rhytismatales, Ascomycota) was erected to accommodate the "earth tongue fungi" in the genera Cudonia and Spathulafia.There have been no recent taxonomic studies of these genera and the evolutionary relationships within and among these fungi are largely unknown.Here we explore the molecular phylogenetic relationships within Cudonia and Spathularia based on maximum parsimony, maximum likelihood, and Bayesian inference analyses of multiple genes from 111 collections from across the Northern Hemisphere.