Abstract
Summary The comparative histological study of compatible and incompatible pear/pear and pear/quince grafts shows, 22 days after grafting, the neocambium setting in a previously formed junction callus. The weakest continuity between the two neocambiums occurs in incompatible heterospecific grafts. The orientation of the neocambium produced by the scion is a good discriminating factor for exactingness of the two studied varieties. The exacting variety neocambium folds back, describing a loop, whereas the non—exacting variety neocambium follows a straighter path towards the stock cambium.
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