Abstract
Epiphytic vegetation of lichens and mosses was investigated on trunks of Abies cephalonica on Mount Aenos, Kefallinia, Ionian Island (Greece). A simple sampling design involving a series of relevés along decreasing altitude revealed clear clinal pattern of floristic variation in the epiphytic flora. Species richness of both mosses and lichens were negatively correlated with the increase of altitude, suggesting that the cold-stressed top of the mountain (and the frequency of fog precipitating on the top) play major role in the epiphytic community structuring even along a short altitude span of 200 m.