The biggest organism in the world is a mycelium that spreads across 3.8 km (2,384 acres) in Oregon’s Blue Mountains. It’s called Armillaria Mellea, or the honey fungus, and is thought to be over 2,000 years old: https://www.scientificamerican.com/article/strange-but-true-largest-organism-is-fungus/ http://www.bbc.com/earth/story/20141114-the-biggest-organism-in-the-world
