A new classification for the family Graphidaceae (Ascomycota: Lecanoromycetes: Ostropales)

A revised classification for the emended family Graphidaceae is proposed, based on recent phylogenetic studies, including the finding that three previously separated families (Asterothyriaceae, Gomphillaceae, Thelotremataceae) are nested within Graphidaceae and in part polyphyletic. The family comprises three major clades which are here delimited as subfamilies Fissurinoideae, Gomphilloideae, and Graphidoideae. The latter is composed of three major clades which are formally delimited as tribes Graphideae, Ocellularieae, and Thelotremateae. In addition, three new genera are described to accommodate the Ocellularia clandestina (Clandestinotrema) group, the Ocellularia cruentata group (Cruentotrema) and Myriotrema pycnoporellum (Pycnotrema). Keys are provided for the species placed in the new genera.