Newly discovered localities of the tree lungwort (lung lichen) are reported from Stara Planina Mts (Elenova Gora Reserve), Mt Slavyanka (Ali Botush Reserve), West Frontier Mts (Maleshevska Planina, Sokolata Reserve) and Rhodopi Mts (Mantaritsa Reserve). Brief historical background, including information on previously published data on Lobaria pulmonaria from Bulgaria, is presented. As one of the species, being under protection of IUCN, the knowledge on its current distribution is still scarce. An UTM-grid map of the certain locations, supported by data from collections studied and available literature sources, is applied.