Mushrooms, anybody?

When walking through the forest I saw these mushrooms growing happily on an old and decaying tree trunk. I know that you can gather mushrooms in the forest (my inlaws in Poland and their neighbours do it all the time), but my knowledge is dangerous. Actually my knowledge is not even dangerous. It is nonexistent. I know nothing about what mushrooms are safe to eat, so I though it best to just look, take a photograph and leave my breakfast until I got back to the house.