We pick and eat lots of different kinds of mushrooms that naturally grow in Finland. For example, various kinds of chanterelles, russulas, boletes, vax caps and milk-caps. We even eat even false morals that require careful preparation to make them non-poisonous. Unfortunately, the English wikipedia does not show pictures of nearly all my favorites, not even the absolutely best one, yellowfoot chanterelle.

Anyhow, I would never even pick up (in order to smell it or anything) any all-white mushroom that looks like the one in your first picture, because it looks very similar to the mushroom that is the most poisonous in my country: http://en.wikipedia.org/wiki/Destroying_angel. Only this summer, eight people were treated in a hospital, some in very severe condition, all for eating this mushroom. Usually, we have only few cases per year, but this year, these mushrooms were so very abundant that even experienced pickers were fooled. Fortunately, only one of the eight has died, but she was very experienced.