Found this mushroom today. It's a kind of puffball mushroom and I think pestle puffball but I hope someone can confirm that/point me to other likely species.
It was in Central Eastern Sweden (Uppsala) in a pine and birch forest. Autumn has been quite dry so the season may be a bit delayed. They were in bunches of 2-5 mushrooms, they are about 1-4cm across the ball and the stem is quite fat plus about 1-3cm long. They are white through the middle.