As shown by studies, radionuclides are present not only in green plants but also in fungi. They uptake them via mycelium and also through the entire body surface, accumulating them in fructifications. The Department of Radiological Protection of the Sanitary and Epidemiological Service at Płock found that caesium content in 5 species of edible fungi in Poland was in 1986 slightly higher than that found at the same time in Germany and three times less than concentrations found in Austria.