Resumen de Sierra Nevada (Spain), the southernmost European locality for the polar-alpine Umbilicaria aprina and U. virginis

Leopoldo García Sancho, Ana Aramburu, Ana Pintado Valverde, Manuel Casares Porcel, José Raggio Quilez, David Sánchez Pescador

• Two strict polar-alpine Umbilicaria species (U. aprina and U. virginis) are reported growing together in Los Peñones de San Francisco. Other localities known on the highest summits of the Alps and Pyrenees are considered. We discussed the meaning of these isolated populations as glacial relicts.