A sample of a rust fungus on Cymbopogon citratus (lemongrass) was collected in medicinal gardens in the municipality of Seropédica, State of Rio de Janeiro. The fungus was identified as Puccinia nakanishikii (Uredinales). This is the first report of this species in Brazil. It differs from Puccinia cympopogonis, another species belonging to the same genus and also recorded on the same host in Brazil, mainly by the presence of equinulate urediniospores, and capitate paraphyses within its urediniospores. A voucher was deposited in the Herbarium RB, at the Jardim Botânico do Rio de Janeiro.
Uredinales; Poaceae; etiology; plant disease
