Penicillium sp. identification to species is difficult. Many species of this mold are know as probable mycotoxin producers and can be found on various substrates. Identification is important when isolating from food contamination. Often found in soil, decaying plant debris, compost, rotting food, and house dust. Can thrive and grow in water damaged environments on wall paper, fabrics, behind paint and interior fiberglass duct insulation contributing to poor indoor air quality. Cause of extrinsic asthma. Acute symptoms include edema and brochiospasms, chronic cases can develop pulmonary emphysema associated with headaches, vomiting and diarrhea. Associated with infections of the ear and cornea. Usually nonpathogenic, Penicillium marneffei is capable of causing infection of the lymphatic system, the lungs, liver, skin, spleen and bones (St-Germain 166).