Using of scanning electron microscopy was observed the morphology of needles surface and the localization of emission on the stoma apparatus of the needles in Picea abies and Pinus cembra. It was done from two mountain regions of Slovakia [Czechoslovakia], (Moravsko-Sliezske Beskydy, Vysoke Tatry Mountains). It was determined that the presence of emissions in the stomata of needles reduces their physiological function and also can cause the decrease of the photosynthesis processes, in the long run, can cause the general physiological weakening of spruce vitality.