A rapidly-growing fungus that produces a dark brown, or olivaceous brown colony with a dark reverse, within five days, when incubated at 25oC (77oF). The hyphae, conidiophores, and conidia are pigmented olivaceous-brown. It is found worldwide and is very common. It can be isolated from the air, plants, grasses, grains, decaying food, and soil. Rarely, it can be an opportunistic human pathogen causing subcutaneous or systemic disease.