The Willamette Stone

Historical marker location:

Portland, Oregon

( Marker is on NW Skyline Boulevard, 0.4 miles west of West Burnside Road, on the left when traveling west.)

The largest living organism in the world is a fungus in Oregon. The Armillaria ostoyae fungus covers over 2,200 acres of forest in eastern Oregon and is estimated to be over 2,400 years old. It is also known as the "Humongous Fungus."