Blastomyces dermatitidis is a thermally dimorphic fungus and causes blastomycosis. Single broad-based bud in a clinical sample is diagnostic.
Histoplasma capsulatum is an intracellular, thermally dimorphic fungi. It causes systemic mycoses called histoplasmosis.
Dimorphic fungi exist as molds in the environment at ambient temperature and as yeasts in human tissues at body temperature.
