When selecting dried mushrooms, smell their fragrance, and the unique fragrance of mushrooms is good; Looking at its shape, the mushroom meat is thick, the mushroom surface is smooth, the size is uniform, the color is yellow-brown or black-brown, the good mushroom surface is slightly frosted, the mushroom folds are tight and white, and the mushroom stalk is short and thick, dry and unbreakable. In recent years, Lentinus edodes has been hailed as a "new anti-cancer recruit" because it contains a kind of "β-glucosidase", which can improve the body's ability to inhibit tumors and strengthen its anti-cancer effect.

The quality of dried mushrooms is generally evaluated from four aspects: shape, color, fragrance and water content.

Morphology: the quality of mushroom is the best, and it can also be identified from these aspects: the mushroom cap is thick and complete, and it is better to open it incompletely; Straighty and close-knit; The stipe is short and stout; It is better to have the edge rolled in and thick. The picture on the right shows the mushroom.

Color: It has the unique color of Lentinus edodes, mostly yellow-brown or black-brown, with bright and bright color as the best; The color of bacterial folds is light yellow to milky white.

Aroma: it has a strong and unique aroma of mushrooms; Without fragrance, or with other strange and musty taste, the quality is poor.

Water content: dried shiitake mushrooms should be dried, and the appropriate water content is 1 1%~ 13%. It can't be too dry, and it will break when you pinch it. This quality is not good. Too wet is not conducive to storage and easy to deteriorate.