The fruiting body of Betula platyphylla is annual, creeping and attached, and it is not easy to separate from the substrate. Generally, it grows under the bark, from cork to hard cork when fresh, odorless and tasteless, and the wood is hard after drying. The length, width and thickness of the plane can reach 20cm, 7cm and 5 cm respectively. The sterile edge is narrow or wide, pale yellow, milky yellow when it is active, and the width can reach 5 mm.
The surface of the orifice is brown to dark reddish brown, with strong refractive response; The orifices are round, 6-7 per mm; The edge of the nozzle is generally full, but it will tear slightly when it is old. Mushroom meat is light yellow, cork-shaped, very thin, no more than 65438 0 mm. The mushroom tube is dark brown, cork-shaped when fresh, and the wood is hard to brittle after drying, up to 3mm long.
The origin of chaga
Chaga is mainly distributed in the northern hemisphere at 45 ~ 50 degrees north latitude, such as northern North America, Finland and Poland in Europe, Northern Europe, Western Siberia in Russia, Lake Baikal, Far East, kamchatka peninsula, Daxinganling region in Heilongjiang, China, Changbai Mountain in Jilin Province and Hokkaido in Japan.