Abstract
A new corticolous species of Byssoloma, B. rubromarginatum Messuti and de la Rosa from Nothofagus dombeyi forests is described and illustrated. The new species is characterized by the morphology of the thallus and apothecia, the 3–5 (7)-septate ascospores, the presence of an anthraquinone in the exciple, and its ecology. It is the first species within the genus known to have gyrophoric acid in the apothecial margin. A key to Byssoloma species known from Nothofagus temperate forests in South America is provided.
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