1. Fasciation of the stem is frequent in jute plants raised from seeds treated with X-rays; it takes the common ribbon form, and the stem may attain a width of 2-4 inches. The leaves are arranged in two groups crowded at the apex. 2. Anatomy of the fasciated shoot apex shows that fasciation results from transverse dilation of a single growing point. 3. Leaves do not grow normally and are slow in dissociation from the shoot apex. 4. Fusion between leaf and leaf, between leaf and stipule, and between stipule and stipule is a common feature. 5. The central pith cells elongate parallel to the broad axis of the stem. 6. Phloem collapses. This disintegration may possibly be responsible for upsetting the normal growth and dissociation of leaves from the apex. In initial stages of fasciation the failure of dissociation of a leaf would lead to the continuation of the elliptical form of the node in the internode above. This could induce lateral stress on the apex and lead to a change in its shape. 7. Bifurcation occurs following the formation of two growth centers within the laterally expanded apex.