Armillaria solidipes (ostoyae)

''Armillaria solidipes'' is a species of plant pathogenic 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 ostoyae'' is quite common on both hardwood and conifer wood in forests west of the Cascade crest.