Humongous Fungus (a colloquial name given to large mushrooms) may refer to:
* An ''
Armillaria ostoyae
''Armillaria ostoyae'' (synonym ''Armillaria solidipes'') is a species of fungus (mushroom), pathogenic to trees, in the family Physalacriaceae. In the western United States, it is the most common variant of the group of species under the nam ...
'' specimen in
Malheur National Forest
The Malheur National Forest is a United States National Forest, National Forest in the U.S. state of Oregon. It contains more than in the Blue Mountains (Pacific Northwest), Blue Mountains of eastern Oregon. The forest consists of Great Basin ...
in Oregon, covering
* An ''
Armillaria gallica
''Armillaria gallica'' ( synonymous with ''A. bulbosa'' and ''A. lutea'') is a species of honey mushroom in the family Physalacriaceae of the order Agaricales. The species is a common and ecologically important wood-decay fungus that ...
'' specimen in Michigan, covering
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