Saussurea involucrata is a kind of boletus with indigo reaction after injury. There are many kinds of Boletus, most of which are Boletus, and some other genera. Such as: Flammulina velutipes, Boletus farinosus, etc. Generally speaking, there are more than 20 species of Polygonum multiflorum in Yunnan, including 10 species, such as: (Polygonum multiflorum: Boletus farinosus, Boletus lateralis, Boletus farinosus, etc. (Bare hands: Boletus farinosus, Boletus haemolyticus, Boletus Burgundy, etc. ). (Huang Jianshou: yellow boletus, boletus, green boletus). (Black hand: Boletus Camellia, Boletus fuscus, etc. ). (Purple hand: Boletus purpurea, Boletus purpurea, etc. ). But a few of them are toxic, such as Boletus reticulata, Boletus tenuipes, Boletus powder, Boletus viridis and so on. A part of Folium Isatidis can be safely eaten in many places, but poisoning may occur in a few places after eating, so it is best to give priority to local mushroom eating customs. It is better not to eat what you can eat than to eat it safely.