Armillaria solidipes , an older name for the fungus called Armillaria ostoyae

The name  Armillaria ostoyae  has been applied for nearly 40 years to the  Armillaria  species that causes a major root-rot of conifers throughout Europe, the northern United States, much of Canada, and more recently in China. However, C.H. Peck described this species in 1900 under the name  A. solidipes,  well before the name  A. ostoyae  was coined by Romagnesi in 1970. Thus, the name  A. solidipes  must be used for the taxon wherever it occurs.