Mitosporic fungus. Hyphomycetes. Teleomorph (sexual state): Pseudogymnoascus.
Geomyces species comprise a very small proportion of the fungal biota and are most closely related to Chrysosporium species. Health effects include rare cases of onychomycosis. No information is available regarding toxicity. Allergenicity has not been studied. May be identified on surfaces by tape lifts, tease mounts from bulk samples, and in air by culturable (Andersen) samples. (Spores do not have distinctive morphology and would be categorized as "other colorless" on spore trap samples.) Widespread in the soil.