Myriolecis nigrodisca is described as a new lichenized fungus. It is characterized by having a crustose and often conspicuous yellowish to beige thallus, black, often confluent apothecia with grey to whitish-grey pruinose and fissured discs. Morphological and anatomical analyses confirm the position of the new species within Myriolecis. It is strongly supported by the phylogenetic analyses using the maximum likelihood method based on nrITS and mtSSU sequences. Additionally, a detailed description of the morphology, illustrations, distribution, ecology and a brief discussion of this species are provided. Key words: Lecanoraceae, phylogenetics, taxonomy.