A survey of the parmotremoid lichens occurring in the central area of Rio Grande do Sul State (Brazil) revealed 31 species of Parmotrema A. Massal., distributed in three groups corresponding to the former genera Canomaculina Elix & Hale, Parmotrema s. str. and Rimelia Hale & Fletcher. All species are described, illustrated, commented and special notes compare similar species as an aid to identification.
Canomaculina; Parmotrema; Rimelia; Rio Grande do Sul