a) Geographical position of the Laga Mountains in the context of the Central Apennines range. b) Alignment of the main peaks of the Laga Mountains following a N-S direction, viewed from the top of Mount Pizzo di Sevo (2419 m a.s.l.): M. Cima Lepri (2445 m a.s.l.), M. Pizzo di Moscio (2411 m a.s.l.), M. Gorzano (2455 m a.s.l.) and M. Cima della Laghetta (2369 m a.s.l.). c) Typical pelithic-arenaceous substrates of the Laga Mountains Flysch; d) North-facing deep valley known as “Fosso Pelone” (one of the sampled areas) (Photo R. Di Pietro and F. Di Pietro).