Amanita muscaria guessowii (American yellow fly agaric)

Amanita muscaria, commonly known as the fly agaric or fly amanita, is a basidiomycete mushroom, one of many in the genus Amanita. It is also a muscimol mushroom. Native throughout the temperate and boreal regions of the Northern Hemisphere, Amanita muscaria has been unintentionally introduced to many countries in the Southern Hemisphere, generally as a symbiont with pine and birch plantations, and is now a true cosmopolitan species. It associates with various deciduous and coniferous trees.

— Wikipedia