Phellinus igniarius(Fomes igniarius)

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white heartwood rot Photo by Dave Powell, USDA Forest Service, Bugwood.org Taxonomy Kingdom: Fungi Phylum: Basidiomycota Class: Agaricomycetes Order: Hymenochaetales Family: Hymenochaetaceae Genus: Phellinus Species: tremulae Scientific Name Phellinus tremulae (Bondartsev) Bondartsev & Borisov in Bondartsev

USDA Forest Service. 1979. A guide to common insects and diseases of forest trees in the northeastern United States. Northeast. Area State Priv. For., For. Insect and Disease Management., Broomall, PA. p. 123, illus.

Phellinus igniarius (formerly Fomes igniarius) attacks most hardwoods, but prefers beech, birch, and aspen. A closely related fungus, P. tremulae (formerly Fomes igniarius var. populinus), causes more volume loss in aspen than any other trunk rot. The conks of both fungi are black and rough on top and may be shaped like a horse's hoof. A cross section shows several distinct layers of dark-brown pores, some of which may be filled with white, fluffy mycelia. Wood decayed by these fungi is low in density and a pale yellowish-white. Dark zone lines may form at the outer boundaries of the decay.

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Photo by USDA Forest Service - Rocky Mountain Region Archive, USDA Forest Service, Bugwood.org