The black circle of mushroom indicates that it has been stored for a long time, and the nutrients contained in it have gradually flowed back. Eating it is not good for your health, and it tastes bad, because this mushroom has become very old, so it is not recommended to continue eating it.

Therefore, when selecting mushrooms, it is found that there is a circle of black in white mushrooms, so it is recommended not to buy them.

during storage, the mushroom gradually aged, and the umbrella opened and the biofilm fell off. The black folds of Tricholoma matsutake are due to the long storage time and the mature spores in the folds.

this kind of Tricholoma can be eaten, but its taste and nutritional value will decrease.