Phylogeny of the genus s.l. (Sarrameanales, Lecanoromycetes, Ascomycota), with gen. nov. and five new combinations in and .

is a genus of crustose lichens containing 13 accepted species that can be separated into two groups, based on differences in secondary chemistry that correlate with differences in characters of the sexual reproductive structures (asci and ascospores). Molecular phylogenetic analyses recovered these groups as monophyletic and support their recognition as distinct genera that differ in phenotypic characters. Species containing 2'--methylperlatolic acid are transferred to the new genus, Guzow-Krzem., Kukwa & Lendemer and four new combinations are proposed: (Lendemer) Guzow-Krzem., Kukwa & Lendemer, (Lendemer) Guzow-Krzem., Kukwa & Lendemer, (Guzow-Krzem., Łubek, Kubiak & Kukwa) Guzow-Krzem., Kukwa & Lendemer and (Lumbsch, A.W. Archer & Elix) Guzow-Krzem., Kukwa & Lendemer. The remaining species produce thamnolic acid and represent s.str. Haplotype analyses recovered sequences of in two distinct groups, one corresponding to s.str. and one to , the latter being resurrected from synonymy of and, thus, requiring the combination, (Erichsen) Ptach-Styn, Guzow-Krzem., Tønsberg & Kukwa. Sequences of were found to be intermixed within the otherwise monophyletic s.str. These two taxa, which differ in contrasting reproductive mode and overall geographic distributions, are maintained as distinct, pending further studies with additional molecular loci. Lectotypes are selected for , and P.chloropoliaf.cana. The latter is a synonym of . New primers for the amplification of mtSSU are also presented.