Fruiting bodies of the fungus Phellinus ignarius on black walnut, Juglans nigra.

Fruiting bodies of the fungus <i>Phellinus ignarius</i> on black walnut, <i>Juglans nigra</i>.; Portal, Arizona Cochise County Credit: A. James Downer, UCCE Ventura County
Credit: A. James Downer, UCCE Ventura County