Lingzhi (Ganoderma sichuanense), also known as reishi, is a polypore fungus ("bracket fungus") native to East Asia belonging to the genus Ganoderma. Its reddish brown, varnished, kidney-shaped cap with bands and peripherally inserted stem give it a distinct fan-like appearance. When fresh, the lingzhi is soft, cork-like, and flat. It lacks gills on its underside, and instead releases its spores via fine pores (80–120 μm) in yellow colors. In nature, it grows at the base and stumps of deciduous trees, especially maples. Only two or three out of 10,000 such trees will have lingzhi growth, and therefore its wild form is rare. Lingzhi may be cultivated on hardwood logs, sawdust, or woodchips. The lingzhi mushroom is used in traditional Chinese medicine.

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