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650 city blocks is about one-and-a-half times as big as Oregon's Armillaria ostoyae.
In other words, it's 1.460 times the size of Oregon's Armillaria ostoyae, and the size of Oregon's Armillaria ostoyae is 0.6850 times that amount.
(a.k.a. Shoestring Rot) (Malheur National Forest, near John Day, Oregon) (if considered single organism)
The Armillaria ostoyae fungus of Malheur National Forest is a giant fungus measuring 445 city blocks in area. The fungus, which pathologists estimate is between 2,000 and 8,500 years old, began as a microscopic spore and is now considered the largest organism in the world.
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