1, grass color: "color" brownish yellow. The appearance of Cordyceps sinensis is yellowish brown, and the head is yellowish red. Most of the "grass heads" are black, slender, flat in section and slightly yellow in color. Authentic Cordyceps sinensis is better with yellow, clean, bright, plump and hypertrophy, yellow and white cross section, not hollow, short pedestal, no mildew and no impurities.

2, look at the grass shape: "shape" is like a silkworm. Cordyceps sinensis, like silkworms, generally has only one "grass head", and rarely has many branches. The "grass head" has a thick base and a tapering end, with a length of.1~ 4cm. Authentic Cordyceps has rough surface and obvious ring patterns, with 2~3 ring patterns. Dry cordyceps sinensis is brittle and easy to break. After the cordyceps sinensis is broken, there is a hollow or light gray pony hoof imprint on the cross section. The pruning shape of Cordyceps sinensis is mostly slender or slightly curved. Pseudocordyceps sinensis is a symmetrical bump on one side and a stripe with equal parallel gaps on the other side, which is usually poured by a mold.

3, soaking Cordyceps sinensis: Cordyceps sinensis is soaked in boiling water, the worm body becomes swollen and soft, the color of the fungus seat becomes dark brown, and the worm body and the fungus seat are closely connected and do not fall off. The immersion liquid has a slight odor. After being soaked in boiling water for 1 min, the pseudocordyceps sinensis will slowly show its original shape, with yellow embryo opening and falling off, and the pseudomycetes will also start to fall off and separate from the insect body.

4, smell the grass: "taste" is strong. Genuine mushrooms have a natural aroma or a slight fishy smell, while counterfeit mushrooms generally have no smell.