Another One

I am fascinated by this particular mushroom. (more than I am usually fascinated by them) It is growing on a stump beside our driveway. Most individual mushrooms I see on our place are only around for a day or two before they shrivel up and die or whatever happens to them. Other than growing very slowly in size, this one has remained unchanged for over a week. And the brown part of it is shiny, which is also unusual.