In the paper was investigated the variability of the morphological and anatomical traits of one-year-old seedlings of different species from the genus Quercus (Quercus robur L., Quercus petraea Matt. Liebl. and Quercus frainetto Ten.) cultivated in a plastic container Bosnaplast 18. The acorn was sown in November 2022, while the measurements of the studied elements were performed at the end of the growing season next year. In terms of morphological characteristics, the highest mean values of both researched parameters (root collar diameter and height) were recorded in Q. robur, followed by Q. frainetto, while the lowest mean values were found in Q. petraea. As for anatomical parameters, the following were analyzed: vessels width, the proportion of bark, pith and wood, as well as the participation of early- and latewood zones. Vessels width shows the least average values in Q. petraea, while no significant differences were recorded between Q. robur and Q. frainetto. The highest presence of wood, as well as the early zone within it, was found in Q. robur. The proportion of bark is a little bit higher in Q. frainetto compared to the other two species, while the pith proportion is significantly lower in Q. robur than in the other two species. Based on the obtained results, we can conclude that Q. robur seedlings show the best performance, before all from morphological point of view.

In this paper the variability of morphological (needle length and needle width) and anatomical (needle thickness, resin ducts width, epidermis thickness, hypodermis height and number of the hypodermis layers) properties of black pine (Pinus nigra J.F. Arnold) needles were studied at the intra- and inter-population levels. Two mountains in Serbia, Jastrebac and Goč, were selected as experimental plots. Three black pine trees were selected from both localities (6 in total). Obtained results showed that trees on Goč had bigger dimensions of the following elements: needle length, needle width, hypodermis height, number of hypodermis layers, needle thickness and epidermis thickness. On the other hand, only resin ducts width was greater by the trees from Jastrebac. The results of the analysis of variance showed that variation between studied populations, as well as variation between trees within populations was statistically significant for all needle traits except resin ducts width and hypodermis height.