Marthamyces coronadoae sp. Nov. in a Fagus grandifolia subsp. mexicana forest from Hidalgo State, México

Marthamyces coronadoae is described as a new species from a relict forest of Fagus grandifolia subsp. mexicana in Mexico. The specimens were collected on fallen and dead Fagus leaves in La Mojonera (in Zacualtipan municipality, Hidalgo State, Mexico). This species is characterized by an apothecium opening by 4-5 pruinose and brownish beige teeth, a pale grey to pale yellow hymenial surface, and ascospores that are curved or coiled when released. A key to species of Marthamyces that grow in America is presented.