I had a pine tree in my yard cut down a year or two ago, and the stump ground, but I didn't have the roots pulled.
A week ago an 8" toadstool appeared where the grindings are, and a when next I looked, the toadstool had completely disappeared. No remains on the ground. What happened? Did something eat it? Did it dissolve in the rain (was there rain?)? I wash my edible mushrooms with water and they don't dissolve. Why would toadstools? What else could have made it disappear?