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Western hemlock (Tsuga heterophylla Sarg.) is an exotic species rarely encountered in Poland. The study site was located in the territory of the Dobrzany Forest District, in the oldest stands of this species in Poland. The research material comprised 20 wood samples from 10 trees aged 78 years. The chronology was built covering the period between 1942 and 2009. Indicator years were determined and dendroclimatological analysis was performed. Thermal conditions in January and February and the amount of precipitation in July and February influenced the tree−rings width. Missing rings were detected in 30% of wood samples in 1982., Sylwan 156 (4): 287-293

The study aimed at dendrochronological and dendroclimatological analysis of radial increments of two Scots pine specimens of atypical stems (fig. 1). Investigated trees grow in the Borne Sulinowo Forest District (tab.). Although the individuals differ with age, the anomaly occurs almost in the same time (fig. 2). Tree−ring widths of analysed pines show greater similarity before the anomaly onset. Atypical stem construction results in variable growth pattern within individual tree. Samples from ‘ridges' are more similar to the master chronology. Climate conditions (temperature in April and June) significantly influence tree ring formation within ‘rows' of tree at site #2 (fig. 3−4). Frost damages originating from extremely low temperature in winter 1956 may be the cause of the observed stem anomaly., Sylwan 155 (8): 555-562

Sylwan 152 (3): 50-57

Sylwan 150 (5): 44-50