Is the underside of the Tricholoma mushroom cap and its interior turning black toxic, and can it still be eaten normally?

Tricholoma mushroom is also called white mushroom because it is white all over, and it is also a rare edible fungus with high nutritional value. But why do some Tricholoma mushrooms bought and left for a while turn black? Is the underside of the Tricholoma cap turning black toxic? Is it normal for the inside of the Tricholoma to be black? Can you eat a Tricholoma that is black inside? Let's take a look below.

Mushrooms of the Tricholoma type have a relatively short shelf life. Generally, after being bought and left for a day they turn black, because the polyphenol oxidase in the cells reacts with oxygen and turns black. If only the surface turns black, it can be eaten, it is just less fresh and the taste will be a bit worse. At this point it is not toxic. If the inside of the Tricholoma fruit body and the stipe turn black, the fruit body loses its springiness or becomes sticky or even has a sour and foul smell, it means it has spoiled, and such Tricholoma cannot be eaten. Eating it not only provides no nutritional value, but can also cause safety hazards or harm to the body.