Fig. 1. Young trees of N. dombeyi (A) and N. pumilio (B) such as those selected for the present study. C, Diagrammatic representation of a Nothofagus tree in which main branches, secondary branches and short branches are indicated. Thick horizontal lines on the tree trunk indicate limits between two successive annual growth units. A parent growth unit (green stem) and its sibling growth units (green stem with black leaves) are shown in the detail.