Psilocybe stuntzii, also known as Stuntz's blue legs and blue ringers it is a psilocybin mushroom of the family Hymenogastraceae, having psilocybin and psilocin as main active compounds.

The mushroom is named in honor of mycologist Daniel Stuntz of the University of Washington.

[citation needed] Psilocybe stuntzii is found growing scattered to gregarious to cespitose, rarely solitary, in conifer wood chips and bark mulch, in soils rich in woody debris, and in new lawns of freshly laid sod or any newly mulched garden throughout the western region of the Pacific Northwest.

There was a time when this mushroom appeared in over 40 percent of all new lawns and mulched in areas in the Puget Sound region of the Pacific Northwest.

Due to a disappearance of pastures south of Seattle in the Tukwila-Kent-Auburn areas, this mushroom now only appears sporadically in certain new lawns which are well fertilized and manicured.