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Armillaria solidipes
''Armillaria solidipes'' (formerly ''Armillaria ostoyae'') is a species of fungus in the Physalacriaceae family. It is the most common variant in the western U.S., of the group of species that all used to share the name ''Armillaria mellea''. ''Armillaria solidipes'' is quite common on both hardwood and conifer wood in forests west of the Cascade crest. The mycelium attacks the sapwood and is able to travel great distances under the bark or between trees in the form of black rhizomorphs ("shoestrings").
In most areas of North America, ''Armillaria solidipes'' can be separated from other species by its physical features. Its brown colors, fairly prominent scales featured on its cap, and the well-developed ring on its stem sets it apart from any ''Armillaria''. (Herink, 1973)
It is known to be one of the largest living organisms, where scientists have estimated a single specimen found in Malheur National Forest in Oregon to have been growing for some 2,400 years, covering 3.4 square miles (8.4 km²) and colloquially named the "Humongous Fungus". ''Armillaria solidipes'' grows and spreads primarily underground and the bulk of the organism lies in the ground, out of sight. Therefore, the organism is not visible to anyone viewing from the surface. It is only in the autumn when this organism will bloom “honey mushrooms”, visible evidence of the organism lying beneath. Low competition for land and nutrients have allowed this organism to grow so huge; it possibly covers more geographical area than any other living organism.〔(【引用サイトリンク】 publisher = Extreme Science )〕
==Taxonomy==
The species was formerly known as ''Armillaria ostoyae'' Romagn., until a 2008 publication revealed that the species had been described under the name ''Armillaria solidipes'' by Charles Horton Peck in 1900, long before Henri Romagnesi had described it in 1970.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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