A novel sequestrate species from Mexico: sp. nov. (Hysterangiaceae, Hysterangiales).

Knowledge of sequestrate Hysterangiaceae fungi in Mexico is very limited. In the present study, a new member of the family, , is described. This speciesis closely related to , but differs from the latter in possessing a tomentose peridium 165-240 µm thick, with occasional large terminal hyphae up to 170 µm, a variable mesocutis (isodiametric to angular), and distinct bright yellowish subcutis.

Description and distribution of sp. nov. and in the Transmexican Volcanic Belt.

The genus is a lineage of diverse ectomycorrhizal, hypogeous, sequestrate ascomycete fungi that are native to temperate forests in the Northern Hemisphere. Recently, many new species of have been described in North America and Asia, based on morphological characteristics and molecular data. Here we describe and illustrate a new species, , based upon phylogenetic analysis and morphological description.