A rapidly growing fungus that produces a bluish-green colony within ten days, when incubated at 25oC (77oF). It is a thermotolerant fungus and is very common worldwide. It can be isolated from air, plants, foodstuffs, soil, sand beaches, caves and mines, activated sludge, mangrove swamps, freshwater, compost, animal dung, silage, fodder, and cotton fabrics in the tropics. It is one of the most common causes of systemic fungal disease in humans and animals causing acute or chronic respiratory tract infections. It is a well documented allergen.