The fruiting body is huge, horseshoe-shaped and sessile. Most of them are gray, taupe, light brown to black, 8-42× 10-64cm, 5-20cm thick, with thick cuticle, obvious bands and rings, and dull edges. The bacteria tube is multi-layered, and the color layer is sometimes obvious, each layer is about 3-5cm thick and rusty brown. The bacteria tube is cork, 0.5-5cm thick, rusty brown, with 3-4 nozzles per mm, round, gray to light brown. Perennial, born on oak, birch, poplar, willow, linden, elm, ash, pear, plum, apple and other broad-leaved trees or stakes. Rod-shaped deformed fruiting bodies often appear in wet or dark habitats.

It can be used as medicine, and has the functions of promoting digestion and removing blood stasis. It tastes slightly bitter and has a flat nature. The inhibition rate of sarcoma 180 in mice reached 80%. Can be used for treating esophageal cancer, gastric cancer, uterine cancer, etc. It is a wood rot fungus, which causes white rot of standing wood, fallen wood and dead wood.