This white to grayish-tan milky mushroom has a convex convex cap 2-6 inches wide that becomes sunken with age. The flesh is white.
The white to cream gills are attached to the stem and closely crowded together.
The dry, white stalk is 3/4 to 3-1/4 inches long, 3/8 to 1 inch thick. It's so short, the mushroom often looks like a stone embedded in the ground.