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Chlorophyllum molybdites
The cap is whitish in colour with coarse brownish scales. The gills are free and white, often with a greenish tinge. The tall stipe may be up to 25 cm tall and bears a ring. This mushroom lacks the snakeskin pattern that is generally present on the parasol mushroom.
Grassy areas,lawns and parks across eastern North America and California, and subtropical regions around the world. Fruiting bodies generally appear after summer and autumn rains.
Highly poisonous and producing severe gastrointestinal symptoms of vomiting and diarrhea, it is commonly confused with the shaggy parasol, and is the most commonly consumed poisonous mushroom in North America. Its large imposing appearance and similarity to the edible Parasol mushroom, as well as its habit of growing in areas near human habitation, are reasons cited for this
These are probably green-gilled mushrooms (one of the 'fairy ring mushrooms).