The Largest Living Organism is a Fungus!

The Armillaria ostoyae, popularly known as the honey mushroom, started from a single spore and has been spreading its filaments through the forest for an estimated 2,400 years, killing trees as it grows. It now covers 2,200 acres.

The outline of the giant fungus stretches 3.5 miles across, and it extends an average of 3 feet into the ground. It covers an area as big as 1,665 football fields. No one has estimated its weight.

On the surface the only evidence of the fungus are clumps of golden edible mushrooms that pop up in the fall with the rain.