"Lactarius piperatus, Pepper Cap
Centre and left: Peppery mushrooms, acrid, raw, like laundry soap when cooked. In America, considered indigestible. In Europe, once used dried and powdered as a substitute for pepper."
In publication, Page 39: "Reflections on the Fungaloids" by B.L. Williamson, Ottawa, 1992. ISBN 1-894572-65-3