| Abstract: | Summary The author has studied the grouth stages in the main stem of an olive-tree in Florence; the data obtained are compared with those from similar studies on trees of the same species in Bari and Camerino. In Florence, as in Camerino, the differences in habitat and climatic factors as compared with the Bari ones have noticeable effects on the cambial activity. In Florence as in Camerino the rythmic wood production, typical of the trees growing in Bari (that is a region where the climatic conditions are more similar to those required by the species) occurs only in the autumn, while in the spring the process of wood formation is uninterrupted until summer. The period of rest in summer is very short. The activity of the cambium, after the summer resting period, is renewed noticeably earlier in Florence than in Camerino, because of the more favourable climatic conditions, especially temperature. In an exceptional growing period (March) an anomalous undifferentiated tissue is formed, the same that has been found in Camerino in August. |
