There are rings and volvox on the handle at the same time, and most of the folded mushrooms are poisonous. Basidiocarp is umbrella-shaped, fleshy, and the mushroom cap is often left by various kinds of Agaricus, including Volvariella (sometimes it is not obvious and becomes the base of the swollen stalk), with or without sterile rings, and the mushroom pleats are white, terrestrial, and often symbiotic with FAGACEAE plants. Pleurotus nebrodensis is characterized by growing on the ground of rotten organic matter such as weeds, and its folds are usually white, light yellow to yellow-green, with obvious annual rings. It used to be called Pleurotus ostreatus, but now it is divided into several genera, all of which have some poisonous species. Pleurotus ostreatus belongs to this kind of fungi. Mushrooms that grow on the feces of cattle and horses have a large proportion of toxic bacteria. Although they belong to different taxa in taxonomy, they are similar in toxicity and can usually cause symptoms of nervous system poisoning and gastrointestinal poisoning. As for the mushrooms in your picture, they should be nontoxic, but they should be picked according to the time, season and place. It is recommended not to eat it to avoid accidental poisoning.