Mushrooms are traditionally classified as plants biologically speaking. However, meanwhile they are believed to be more closely related to animals. Mushrooms do not form chlorophyll and, thus, rely on organic food (humus). They do not require light to grow, but need moisture and warmth. These characteristics enable a selective cultivation of some varieties. Edible mushrooms are a relatively small group within the fungi family.
The development of a so-called pillar-fungus or basidiomycota (this family includes most edible species) works as follows: the fungi spores develop into a multitude of long cell filaments, called hyphae. The mass of hyphae form the mycelium, a subterranean, branching network of fungal threads. The hyphae cluster at various parts of the mycelium forming fruit-bearing bodies above the soil, which form new spores in their lamella or tubes.