Spotting

Hello Natasha12 and Welcome to the Project Noah community!
I think you are rigth,this is a macrolepiota sp. probably the poison macrolepiota venenata,many times confused with the edible Macrolepiota procera.Iam using my european experience but iam 100% sure that is a Macrolepiota sp. not edible.
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Yes, probably. It has white slits and a skirt. Both are signs that this is poisonous.