Lingzhi, Ganoderma lingzhi, also known as reishi, is a polypore fungus belonging to the genus Ganoderma.
Its red-varnished, kidney-shaped cap and peripherally inserted stem gives 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. Depending on the age, the pores on its underside may be white or brown.