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Armillaria ostoyae
This species is known to be one of the largest living organisms! Scientists have estimated a single specimen that was found in Oregon to be 2,400 years old, covering 3.4 square miles (2,200 acres; 8.8 km2)! So, it has been nicknamed the "Humongous Fungus". The fungus grows and spreads primarily underground. Hence, the organism is invisible above ground. In the autumn, it fruits mushrooms.
Habitat: Growing at the base of a tree (oak, I think) in a mixed forest.
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