Amanita viscidolutea, a new species from Brazil with a key to Central and South American species of Amanita section Amanita.

We described and illustrated Amanita viscidolutea sp. nov. from specimens collected in the state of Rio Grande do Norte, northeastern Brazil. The main characteristics of the new species are its yellow pileus with white margin, the viscidity of the pileal surface, an exannulate stipe and inamyloid basidiospores. We also present an artificial dichotomous key to Central and South American species of Amanita (subgenus Amanita) section Amanita.