In the Blue Mountains of eastern Oregon lurks one of the strangest and oldest known organisms on planet Earth- a giant fungus that has been around for over 2,400 years. Armillaria ostoyae, also known as the “shoestring fungus” or “honey mushrooms”, covers an area of 2200 acres, or 3 square miles, making it the largest organism ever discovered. It began its life cycle as a single spore, too small to be seen by the naked eye, and is estimated to have been slowly spreading for at least the past two and a half millennia, although some experts estimate that it is around 8000-years-old.
The giant fungus spreads through the root system of the forest under which it resides and slowly kills whatever is in its path, making it not only the largest organism on the planet but also one of the most deadly. For a few weeks each autumn, the honey mushroom erupts in yellowish clusters with caps, gills and spores, but the rest of the year it takes the shape of a thin white layer, similar to latex paint. It is in this less conspicuous form, however, that the fungus is most lethal, as it can spread more easily through the trees.