García Sancho, Leopoldo, Aramburu, Ana, Pintado, Ana, Casares, Manuel, Raggio, José, and Sánchez-Pescador, David. 2022. Sierra Nevada (Spain), the southernmost European locality for the polar-alpine Umbilicaria aprina and U. virginis. Mediterranean Botany 43, e77925. DOI:https://doi.org/10.5209/mbot.77925