Any of several fungi of the genus Armillaria that form brown stringy rhizomorphs and cause destructive rot of the roots of some trees such as apples or maples.

• 任意一种属于armillaria种的真菌，有褐色的纤维的根状菌束，在诸如苹果树或枫树的一些树木的根部造成毁灭性腐烂。