Аннотация:[ON THE ORIGIN OF ANOMALOUS MODUS OF THE SECONDARY THICKENING OF AXIAL ORGANS IN CENTROSPERMS] Hypotheses on the the origin of special modi of the secondary thickening of the axial organs in centrosperms are critically reviewed. These modi are hypothesized to originate basing on cambium reparation processes caused by destructions which are usual in Dicotyledons. In the course of centrosperm evolution the external factors which regulated appearence of new cambium in the organ were replaced by the internal ones. It is this replacement that has transformed the trivial cambium reparation into the new specisl modus of secondary growth. In the course of subsequent evolution the regulative role has drifted from the organogenesis to the intrinsic genetical mechanisms.