Microglossum atropurpureum is a species of fungus in the family Leotiaceae.

Ascocarps (fruit bodies) are black, often with a purple tint, and are irregularly club-shaped.

They occur in soil and resemble earth tongues, but are microscopically distinct.

The species was formerly referred to the genus Geoglossum, but is not closely related to the Geoglossomycetes.

[2] Microglossum atropurpureum is found in eastern North America and Europe, where it is typical of waxcap grasslands, a declining habitat due to changing agricultural practices.