KEYS TO THE LICHENS OF ITALY - 02) PARMOTREMA
Pier Luigi Nimis
Responsible for the apparatus of images: Andrea Moro - Management of the software and databases: Stefano Martellos
This genus of the Parmeliaceae is characterised by foliose thalli forming short and broad, often ciliate lobes, a pored epicortex, cylindrical conidia, a usually wide bare marginal zone on the lower surface, and the intermediate type of lichenan between Cetraria- and Xanthoparmelia-type lichenan. Currently the genus comprises c. 300 species which occur mostly in the tropics, especially in the Pacific Islands and South America. Seven species are known to occur in Italy, all of them bound to rather humid microclimatic conditions. The most common species is P. perlatum, the rarest are P. hypoleucinum and P. robustum, which are confined to a few undisturbed sites along the Tyrrhenian coasts.
Project Dryades, Department of Life Sciences, University of Trieste - CC BY-SA 4.0