Irate bears in northern countries apart ticks are a real danger. If you're not sure whether or not there are ticks in the wood you plan to go mushroom stalking enquire first. These links will tell you more:
Walking about with an open knife is asking for it.
Especially children tend suddenly to start running when they have spotted a mushroom some distance away. They then don't look anywhere and apart from stumbling over sth. low branches are a real danger for the eyes. Always look where you go.
If you go on a foray on your own always let somebody know where you plan to go and when you intend to be back.
Common sense is the best saftey advisor. For an excellent systematic approach see the website of