Nuove stazioni di Utricularia bremii Heer ex Kölliker (Lentibulariaceae): considerazioni sulla sua distribuzione e conservazione in Italia

The occurrence of three new sites of Utricularia bremii, an extremely rare European aquatic carnivorous plant, from Como, Mantova and Bolzano provinces is described. The first two sites make U. bremii a new species for Lombardy; the site from Como province reaches the highest elevation in Italy and the site from Mantova province moves southwards the southern boundary of the species global range. The third site is geographically very close to the well known population of the Lake of Caldaro (Bolzano). These findings lead the Italian populations of U. bremii to five confirmed sites. The distribution and the conservation aspects of this species are also discussed.