Lichenological studies in the western sectors of the Alps : Sesia Valley (Piedmont, Italy)

Ce travail a eu pour objectif l\u27étude de la diversité des lichens dans les régions montagneuses des Alpes. 191 taxa sont présents dans la Valle Sesia (Piémont, Italie); 20 sont nouveaux pour le Piémont, 53 sont nouveaux pour le secteur étudié, enfin 3 sont la deuxième citation pour l\u27Italie. Un catalogue, avec des remarques relatives à l\u27écologie et à la distribution, est présenté.The purpose of the survey was to study lichen diversity in uplands areas of the Alps. 191 lichen species are reported from the Sesia Valley (Piedmont, Italy). 20 of these are new to Piedmont, 53 are new to the investigated area and 3 are the second report for Italy. An annotated list, with ecological and distributional remarks, is given.</p

Lichen colonization on stoneworks: examples from Piedmont and Aosta Valley

Data on lichen presence on some monuments from Piedmont and Aosta Valley are reported. Sampling techniques, chosen on the basis of lithological characteristics of the substrata are described, and the ecological significance of the identified species is discussed. Preliminary data indicate that the majority of the species are neutro-basiphytic and rather nitrophytic, xerophytic and photophytic. Finally, most species appear to belong to the Caloplacion decipientis alliance