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Ancient Oregon Fungus: 8,000 Years and 35,000 Tons

11/15/2025

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Summary

Story summary

The Humongous Fungus in Oregon's Malheur National Forest is an Armillaria ostoyae colony estimated at 8,000 years old, spanning 2,385 acres and weighing up to 35,000 tons, largest by area.
It appears as honey mushrooms for a few weeks a year, while most of its body grows underground and slowly kills trees.
The fungus has cultural significance and attracts tourism, while it provides habitats for wildlife after trees decay.

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Story summary

The Humongous Fungus in Oregon's Malheur National Forest is an Armillaria ostoyae colony estimated at 8,000 years old, spanning 2,385 acres and weighing up to 35,000 tons, largest by area.
It appears as honey mushrooms for a few weeks a year, while most of its body grows underground and slowly kills trees.
The fungus has cultural significance and attracts tourism, while it provides habitats for wildlife after trees decay.