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Armillaria ostoyae (synonym Armillaria solidipes) is a species of fungus , 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 name Armillaria mellea .
Armillaria mellea Armillaria hinnulea. The basidiocarp (reproductive structure) of the fungus is a mushroom that grows on wood, typically in small dense clumps or tufts. Their caps (mushroom tops) are typically yellow-brown, somewhat sticky to touch when moist, and, depending on age, may range in shape from conical to convex to depressed in the center.
A. mellea is the type species of the genus Armillaria.. Armillaria is a genus of fungi commonly known as honey mushrooms. First treated by Elias Magnus Fries in 1821, and later assigned generic rank by Friedrich Staude in 1857, [1] Armillaria is classified in the family Physalacriaceae of the Agaricales, the gilled mushrooms. [2]
Armillaria - among the largest organisms on earth [ edit ] The Malheur National Forest contains the largest known organism (by area) in the Northern Hemisphere: an Armillaria ostoyae ( fungus ) that spans 2,200 acres (8.9 km 2 ) and is located high on a ridgeline immediately west of Clear Creek ( 44°28′23″N 118°28′54″W / 44. ...
Individual fruit bodies need not be individual biological organisms, and extremely large single organisms can be made up of a great many fruit bodies connected by networks of mycelia (including the "humongous fungus", a single specimen of Armillaria solidipes) can cover a very large area.
The largest living fungus may be a honey fungus [25] of the species Armillaria ostoyae. [26] A mushroom of this type in the Malheur National Forest in the Blue Mountains of eastern Oregon, U.S. was found to be the largest fungal colony in the world, spanning 8.9 km 2 (2,200 acres) of area. [25] [27] This organism is estimated to be 2,400 years old.
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"Humongous Fungus", an individual of the clonal subterranean fungal species Armillaria solidipes in Oregon's Malheur National Forest, is thought to be between 2,000 and 8,500 years old. [48] [49] Apart from its extreme age, it is also thought to be the world's largest organism by area, at 2,384 acres (965 hectares).