Armillaria ostoyae is a honey fungus commonly found colonizing both hardwood and conifer wood in forests of the western US. By attacking the sapwood and forming thin, shoestring-like strands known as rhizomorphs, this fungus is able to travel great distances under the bark or between trees. A mushroom of this type found in eastern Oregon’s Malheur National Forest is believed to be the largest fungal colony in the world, spanning 2,200 acres (8.9 km²), and is estimated to be how old? Discuss
Source: The Free Dictionary