Abstract
An anatomical study was made of galls which occur naturally on the stems of boysenberry and Himalaya blackberry plants. The galls form at any region of the stem of the floral canes of plants systemically infected with Agrobacterium rubi and originate from or near the cambial layer, and not from the outer layer of the pericycle. The vascular system in galls caused by A. rubi and A. tumefaciens on broad bean, tomato, sugar beet, loganberry, and Himalaya blackberry plants is connected to the vascular system of the organ on which they are growing.

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