Attractive But Probably Poisonous Mushrooms Growing in My Yard

Anybody know this species?  It might be the edible Caesar's mushroom (Amanita caesarea), or then again it might be the hallucinogenic and toxic fly algaric (Amanita muscaria).  Either way, I'm not eating it, I'm just curious.  If it matters, it was growing underneath a magnolia in north Atlanta.

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