[in Italian with English abstract: ] The macrolichens of the dolomitic-calcareous Musi Mts (Northern Italy) has been investigated visiting 72 sampling sites distributed between ca. 500-1900 m altitude, and encompassing the main vegetation belts typical of the South-eastern pre-Alps. The list consists of 105 infrageneric taxa. Cladonia ramulosa, Collema conglomeratum and Lempholemma polyanthes are new to the lichen Flora of Friuli. For each species brief critical notes on growth-form, morphology and substratum are given, together with a list of sampling sites. Causes that might explain the observed low biodiversity are shortly discussed. Key words: Alps, Biodiversity, Florislics, lichens.