Psorotichia allobrogensis Hue and other lichenological novelties in the canton of Fribourg. The list of lichens collected during the biodiversity days in Montbovon (FR) in June 2009 is presented. Ninety-six species were observed. Several species from other excursions in the canton of Fribourg were added, in particular those recorded during the general meeting of Bryolich in Fribourg in 2007. In total, 34 species are reported for the first time in the canton of Fribourg and one of these is reported for the first time in Switzerland: Psorotichia allobrogensis Hue.