The distribution of epiphytic lichens on Quercus pubescens on the Adriatic side of Central Italy (Abruzzo) was studied along an altitudinal gradient from O to 1000 m by multivariate techniques. The general response of epiphytic lichens to elevation was similar to that found on the Tyrrhenian side of Italy, with great differences in community structure and the altitude of 500 m as an ecotone. However, suboceanic species, which are widespread on the Tyrrhenian side, were rare and confined to higher elevations, or not present at all in the Adriatic gradient. The use of epiphytic lichens as phytoclimatic indicators is discussed.
