Parasola conopilus

thank's gully.moy!
at first I thought was Psathyrella conopilus, it seems I was right :)

It's not Mycena galopus. The stem is too white and the gills are too dark. I think you nailed it with Psathyrella conopilus which is now called Parasola conopilus to reflect advanced in our understanding of how mushrooms are related.

thanks AntónioGinjaGinja for the id!

maybe Psathyrella conopilus?

I think it's a Psathyrella.