This is one of my little treasures in my vintage children's book collection. It tells the story of Bob, a little mushroom, on his way through the forrest where he meets all kinds of other mushrooms, from friendly chanterelles to nasty, poisonous fly agarics. The book wants to teach children the difference between good and bad mushrooms and other food you can find in the forrest. It is from 1948 and there is probably a simple and practical idea behind it - food was rare and bad in post-war Germany and going into the forrest was a usual way to get something healthy to eat. Today, it's mostly a sweet old book and I really love the pictures and all the cute mushroom characters in it.