Flat or rolled into the groove-shaped dried bark, thickness 2-3mm. Appearance of gray and black, rough, vertical and horizontal cracks and small shaped long horizontal lenticels. Branch bark is smooth. By removing the cork surface is reddish brown. Inner surface of the dark red-brown, with white vertical texture (fiber bundle).
Brittle, easily broken, section fibrous.
Indications: detoxification; cooling; insecticide. Indications wind-heat itching; scabies; eczema; abdominal pain; bruises; kidney capsule Wind.