A thick, whitish to grayish bracket, often green with algae, with a lumpy surface, a bump at the point of attachment, and elongated, slot-like pores. It decays the sapwood of beech and other hardwoods. Native to Eurasia, it has been introduced to North America and is spreading there.
Not eaten; the flesh is very tough and leathery. No toxicity reported.
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Saprobic on hardwood deadwood, especially beech stumps and logs, causing a white rot of the sapwood. Alone or in groups; annual, from spring through fall, persisting year-round.
Distribution
Native to Eurasia (described from Europe). Introduced to North America, where MushroomExpert reports it spreading quickly from the Great Plains eastward and in the Pacific Northwest.
Characteristics
Cap: 4-20 cm across, 2.5-9 cm deep and 1.5-5 cm thick, semicircular or kidney-shaped, convex; lumpy, vaguely zoned with velvety and bald areas; whitish, grayish or brownish, sometimes green from algae; margin often yellowish to brown when fresh. Pores: white to pale brownish, usually slot-like and thick-walled, 1-2 per mm (1-3 per mm per Wikipedia), occasionally maze-like; tubes 2-15 mm deep. Stem: absent, or a prominent bump at the attachment. Flesh: white, very tough and leathery; KOH yellow to orange. Odor: often strong and fragrant when fresh. Spore print: whitish to faintly yellowish. Spores: 4-5 x 1.5-2.5 µm, cylindric to long-ellipsoid, smooth, inamyloid. Hyphal system: trimitic.
