The paper presents the results of investigations of 37-year-old undercrop trees of beech, oak, hornbeam, and limetree growing in different densities, on a fresh mixed coniferous site, under the canopy of an about 100-year-old pine tree stand. Measurements of the dbh and of the height were effected, silvicultural quality of individual trees were estimated, and their survival was determined. The results of investigations showed, that the beech was characterized by the best survival and the best silvicultural quality, irrespective of the density. The loosening of the density influenced the increase of the survival of individuals. The dbh was a tree feature, that reacted in an essential way to the enlargement of the area of the growth. The height of the undercrop was differentiated and did not show a distinct relationship with the area of the growth. The hornbeam proliferated the numbers of branches, and that fact influenced negatively the silvicultural quality of that species. The oak was characterized by generally weak silvicultural quality in the undercrop. Reversely, the limetree showed a good silvicultural quality, especially when growing in a great density.
