Volvariella bombycina

This is a key to gilled mushrooms, that is, mushrooms having a definite cap with a fertile surface consisting of gills. The fruiting body usually also has a stem, although that may be lateral or absent (usually, then, the mushroom is growing from wood). You can use this key to identify mushrooms that you find.

Fruiting body containing fibers (usually in the stalk)

Spores pink or reddish

Gills free
Often growing on wood

With a saccate volva, or cup, at the base of the stalk
On a variety of substrates
Cap typically (but not in this picture) bluntly conical, not umbonate or convex

Cap typically more than 2" across

Volvariella bombycina     (Ja.C. Schaeffer: Fries) Singer