Especially in the forest we experience the fascinating diversity of the mushrooms. There they grow on the ground as well as on dead and living trees. They fascinate us through their diverse forms and colors. Many mushrooms form a stem with an umbrella or a cap. However, what we see and call a mushroom is only a small part of this very interesting creature, its fruit body in par¬ticular. Compared to a plant, it is similar to a fruit, in which the semen providing for the repro¬duction of the particular fruit is located.