Honey Mushroom

Armillaria ostoyae, the "honey mushroom", is one of the most common mushrooms in the United States. A colony, much of it underground, located in the northeast area of the country is probably the world's largest: it is estimated at 2200 acres, 605 tons, and may be 2400 years old. If considered to be a single organism, it is the world's largest known living creature.

Photo: Václavka smrková, released into the public domain.