The phylogeny and taxonomy of Violella (Tephromelataceae, lichenized Ascomycota), including a new species from China

<i>Violella yunnanensis</i> C. J. Zhong & L. Hu is described as new to science. It is characterized by its esorediate, areolate to weakly warted thallus, hymenium heavily pigmented with Fucatus-violet pigment, brownish inner ascospore walls, and its chemistry (atranorin and fumarprotocetraric acid). In addition, we collected specimens of <i>Mycoblastus sinensis</i> Kantvilas and <i>Violella wangii</i> T. Sprib. & Goffinet from the holotype localities. <i>Mycoblastus sinensis</i> is transferred to the genus <i>Violella</i> based on its morphology, chemistry and phylogeny, and it is proposed as <i>Violella sinensis</i> (Kantvilas) C. J. Zhong & L. Hu. The morphological descriptions, pictures and molecular phylogenetic analyses of the species are provided, along with a key to the <i>Violella</i> species known from world.