Although the state of Michigan laid claim to the world's largest living thing, the claim for the most humongous fungus in the world now belongs to the state of Washington. Armillaria ostovae covers over 1500 acres, crosses three county lines, and is estimated to be between 400 and 1000 years old! The large fungus is a serious forest management problem in the state, invading tree roots and killing them. (announcement printed in the Washington Totem, Summer 1992).