Tricholoma mutabile

Tricholoma mutabile is a mushroom of the agaric genus Tricholoma. Found in Yuba County, California, it was first described scientifically in 1996. It has a grayish convex cap that is 3 to 9 cm wide, a white stalk measuring 5 to 10 cm long by 0.9 to 2.5 cm thick. The white gills are sinuate, and turn pale golden brown in maturity.