Found in soil, forest soils, fresh water, aerial portion of plants, fruit, marine estuary sediments, wood. Allergen, Type I allergies (hay fever, asthma). Type III hypersensitivity pneumonitis: "humidifier fever", "sauna taker's lung". Growth indoors is widespread where moisture accumulates- especially bathrooms and kitchens- on shower curtains, tile grout, windowsills, textiles, liquid waste materials. Potential toxic production is not known. Rare reports of: isolates from skin lesions, keratitis, spleen abscess in a lymphoma patient, blood isolate from a leukemic patient.