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Chlorophyllum molybdites
White and domed with bumps on it. When I was going over to take pictures of it my dog came to bring me her ball and tripped over it and knocked it out of the ground....oops.
On my grassy lawn with mostly oak and pine trees nearby.
Take a spore sprint. Then I can decide which of two possibilities this is(lay the cap on a piece of paper covered with a bowl, give side down on the paper)