Caloplaca ruderum is reported as new to Sweden from three localities. Based on a phylogenetic analysis it is transferred to the genus Flavoplaca, where the closest relatives are F. communis, F. maritima and F. havaasii. In addition, Caloplaca sol and C. itiana are transferred to Flavoplaca. The identities of C. itiana, C. calcitrapa, and C. dalmatica in the sense of British treatments are discussed.