Coccidioides /kok·sid′ē·oi′dēz/ , a pathogenic dimorphic genus of Fungi Imperfecti of the form-class Euascomycetes, form-family Onygenacaea. In soil it grows as a mycelium with infectious units called arthrospores; in tissue as a spherule with endospores. C. immitis causes coccidioidomycosis and fungal pneumonia.
