Singerocybe clitocyboides

Clitocybe species. But there are dozens of non descript white Clitocybes, so you'll need to check a couple of things. Like the way the cap dries up. These mushrooms tend to be hygrophanous, so does it dry up from the center to the edge, or the other way 'round. Try if you can see the gills through the edge of the cap. Smell it. Some Clitocybes smell like anise or some have a mealy scent. And look at the base of the stipe, is it 'hairy' or plain? To wrap it up, Clitocybes are decayers of dead plant material (saprotrophic). Logicaly, some species are more selective than the other, so find out what kind of shrubs or trees were around!

Some kind of oyster mushroom?