When gathering boletes and other mushrooms for food, avoid picking from polluted habitats such as along heavily trafficked roads, along railroad tracks or power line clearings, near landfills or roadside litter dumps, and chemically treated lawns.
2000, Alan E. Bessette, William C. Roody, Arleen R. Bessette, North American Boletes: A Color Guide to the Fleshy Pored Mushrooms, Syracuse University Press, page 375