A rapidly growing fungus that produces a dark olivaceous brown to dark blackish brown colony within five days, when incubated at 25oC (77oF). The hyphae, conidiophores, and conidia are pigmented olivaceous-brown (dematiaceous). It produces toxic metabolites including tenuazonic acid. It is found worldwide and is very common. It can be isolated from air, plants especially cabbage and cauliflower, foodstuffs, soil, and textiles. Rarely causing an immediate-type hypersensitivity-type I (IgE-mediated) extrinsic asthma and disease that is very common in individuals with atopic disease.