Graphis maomingensis sp. nov. is described from Guangdong Province, eastern China. It is characterized by a concealed disc, striate labia, striatula-morph lirellae, completely carbonized proper exciple, and hyaline transversely 15-21-septate ascospores. The important characters of this species are illustrated. All materials are conserved in the Lichen Section of Botanical Herbarium, Shandong Normal University. Key words—Graphidaceae, new species, Ostropales, taxonomy.