Saproamanita vittadinni (aka "Vittadini's lepidella")
From wikipedia: "Unlike ordinary Amanitas, this species is known to occur without accompanying woody plant symbionts. It has a general aspect somewhat between Macrolepiota and Armillaria, but it is characterized by a pure white colour overall (whilst those genera are brownish) and by the squamous (scaly) covering of cap and stipe."
Picture taken by @the_mushroom_sage
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