Hard skinned Earth Star, also known as Earth Star, is a fungus of the Basidiomycota order in the Hard skinned Earth Star family, mainly distributed in some provinces and regions of Northeast, North, South, and Southwest China. Its spores can be used as medicine and have hemostatic effects. This fungus has a hygroscopic effect and is considered a "forest hygrometer" for observation. Basidiomycota fungi of the order Basidiomycota, belonging to the family Asclepiadaceae. When the sub entity cracks, it appears spherical and exposes the ground after cracking. The outer layer is thick, and when mature, it cracks into 6-18 petals. When wet, it turns outward, and when dry, it rolls inward. The outer surface is gray to gray brown, and the inner side is brown. The inner packaging is made of thin film, flattened spherical, with a diameter of 2-2.8 cm, gray to brown.