Aspropaxillus candidus

About

Aspropaxillus giganteus is a saprobic species of fungus in the order Agaricales. As its name implies, the fruit body, or mushroom, can become quite large—the cap reaches diameters of up to 50 cm (20 in). It has a white or pale cream cap, and is funnel-shaped when mature, with the gills running down the length of the stem.

Summary from Wikipedia