SUMMARYThe monotypic genusCerradoaonAttalea ceraensisfrom Federal District, Brazil is the first rust fungus to be found on Palmae. It has superstomatal sori and is closest to the Andean genusEdytheaon Berberidaceae. We segregateEdytheafromDesmellaon ferns because the sporogenous cells ofEdytheaare produced on emergent hyphae outside of stomata, whereas inDesmellasporogenous cells originate within the substomatal cavity and then emerge.Desmellaand thoseHemileiaspecies with superstomatal type B sori of Gopalkrishnan produce almost identical, unique soral structures. We consider them closely related.Desmellopsis aframomicoladoes not produce truly superstomatal sori and is transferred toPuccinia.