Bolitotherus cornutus is a North American species of darkling beetle known as the forked fungus beetle. As a holometabolic insect, its life cycle includes four life stages: egg, larva, pupa, and adult. All life stages are associated with the fruiting bodies of a wood-decaying shelf fungus, commonly Ganoderma applanatum, Ganoderma tsugae, and Ganoderma lucidum.