A rapidly growing fungus that produces a yellow, later brownish colony within ten days, when incubated at 25oC (77oF). It is commonly found worldwide but especially in the tropical and subtropical regions. It can be isolated from soil, desert soil, mangrove swamps, sewage, caves, fresh and salt water, bird feathers, gerbils, and plants. A mycotoxin producer, it produces a large amount of aflatoxin B1 and trace amounts of aflatoxin B2. There have not been any documented reports of human infections.