Inonotus arizonicus

Inonotus arizonicus is a plant pathogen. I. arizonicus is a locally common saprotrophic polypore that induces white rot in sycamore trees in southwestern North America. Host species include Platanus wrightii (Arizona sycamores) and Platanus racemosa (California sycamores). The fruiting bodies, shaped like hooves or a plate or a stack of plates, can appear on trunks, at the base of living trees, or on stumps or snags. In California this species is generally found south of the San Francisco Bay Area.