Amanita muscaria, commonly known as the fly agaric or fly amanita, is a poisonous and psychoactive basidiomycete fungus, one of many in the genus Amanita. 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 plantations, and is now a true cosmopolitan species. It associates with various deciduous and coniferous trees. (description courtesy of Wikipedia)
On a trail in a coniferous forest near Long Lake in Indian Peaks Wilderness of Roosevelt National Forest.
The cap on this specimen is not completely open.