The anatomical structure of the common fir (Abies alba Mill.) bark. II. Quantitative changes in bark tissues within the stem

W. O. Golinowski


The regularities of the process of secondary sclerification of secondary phloem were investigated. A correlation was found between the number of sclereid layers and the age of the tree. A new sclereid layer forms within the secondary phloem on the average every 4-8 years. The process of formation of the successive layers is not uniform in its course. The differences concern mainly the structure of the successive sclereid layers and the duration of the process of their filling.

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