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Leucocoprinus fragilissimus
A lone, banana yellow mushroom
Growing at the base of a pine tree in a cow pasture. Most of the trees are pine and oak
Leucocoprinus fragilissimus seems a better fit to me, since that species appears outside more often than L. birnbaumii. Also the stipe looks almost transluscent, which is not the case with L. birnbaumii.