The diploma thesis deals with the issue of wood-fungus fungi and their positive impact on waste dendromas which is located in the forest and remains practically unused. The opening chapters, elaborated by the literature on bio-methology, the ecology and properties of wood-boring fungi, to decompose the various biological waste produced by forestry, tell us of the importance of mushrooms in the forest ecosystem and their interrelated relationships, which are an indispensable part of the nutrient cycle in nature. The aim of the diploma thesis was to propose potential biodegradability of waste dendromasis by the wood-chopped fungus uricus (Pleurotus osteratus) in self-created environment conditions using various cultivation methods of dendromass woody beech and spruce white (mixture of sawdust, chips and bark) and woodcuts 20 cm). The whole process from material preparation itself, inoculation, substrate growth to plod growth was thoroughly recorded and evaluated both qualitatively and quantitatively, and biofeedback for individual breeding practices was also evaluated. From our findings, uterine hawthorn has proven to be an excellent wood-destroying fungus that has been able to biodegrade the waste dendromas of both woods in a biologically efficient way, up to the biological efficiency of B.E. 20.8 and 22.3% and dwell on B.E. 0.08 and 0.3% during the first year of mushroom growth.