Sulfur fungus, also known as sulfur polypore, sulfur color polypore, is a kind of fungus. Initial tumor-like, like medulla oblongata, mushroom cap imbricate arrangement, fleshy and sweaty dry light and brittle. The cap is 8-30cm wide, 1-2cm thick, the surface sulfur color to bright orange, with fine velvet or not, wrinkles, no ring band, the edge is thin and sharp, wavy to flap crack. Flesh white or light yellow, tube pores and sulfur-colored, fading after drying, orifice polygonal, average 3-4 per mm. Spores are ovoid, subglobose, smooth, colorless, 4.5-7 × 4-5 μm, and an important feature of this fungus is the wavy arrangement of the ascospores, sulfur-colored. It is edible when young and has a good flavor and is also used medicinally.