Agaricus inapertus, commonly known as the mountain gasteroid agaricus,[2] is a species of secotioid fungus in the genus Agaricus.

It was first described by American mycologists Rolf Singer and Alexander H. Smith in 1958 as Endoptychum depressum.

[3] Molecular analysis later proved it to be aligned with Agaricus, and it was formally transferred in a 2003 publication.

[4]