Stephanosporamayana (Stephanosporaceae, Russulales), a new sequestrate fungus from Yucatán Peninsula, Mexico.

Stephanosporamayana is presented as a new species from the Yucatán Peninsula, Mexico. This species is distinguished by the yellowish pileus, basidiospores with a small corona (4-6 × 1-2.5 µm), and variable size (8.0-17.0 × 6.0-11.0), thin pileus (21-40 µm) and the ecological association to lowland forest with Haematoxylumcampechianum , Gymnopodiumfloribundum , Coccolobadiversifolia , Metopiumbrownei and Pinuscaribaea . It differs from the American species of Stephanospora , like S.michoacanensis and S.chilensis , by its larger basidiospores. Descriptions, photographs and discussions are presented.