A rapidly-growing fungus that produces a dark brown colony with a dark reverse, within five days, when incubated at 25oC (77oF). The hyphae, conidiophores, and conidia are pigmented olivaceous-brown (dematiaceous). It is found worldwide, mainly in the tropics, and is very common. It can be isolated from the air, plants, mangrove mud, estuaries, and soil. Rarely, it can be an opportunistic human pathogen causing mycetoma in man.