Genetic variation of silver fir (Abies alba Mill.) preserved in the Katowice Forest District

environmental pollution greatly decreases a tree's health and results in dieback of forest stands. owing to increasing industrial activity in the 20 th century, silver fir became almost totally extinct in the Katowice Forest District. Only 19 individuals have survived to this day. the aim of the present study is to analyse growth characteristics and polymorphisms of 25 inter-simple sequence repeats ( issr) of the preserved trees. The mean height of the inventoried silver firs was 19 m with a diameter at breast height (DBH) of 29 cm. Flowers were observed on few trees only. however, all trees were of high vitality without signs of fungal pathogen infections or insect out- breaks. Parameters of genetic variability, including mean effective number of alleles per locus and expected heterozygosity, were higher than that described in the literature so far and they amounted to 1.659 and 0.396, respectively