Heterodermia hypoleuca (Muhl.) Trev. and H. squamulosa (Degel.) W. Culb. are reported as new to Brasil, and H. corallophora (Taylor) Skorepa, H. microphylla (Kuork.) Skorepa, H.' trichophora (Kurok.) S. Eliasaro (new combination) are added to the known flora of Rio Grande do Sul state.
Heterodermia; lichens; floristics