Plasmodesmata in the Shoot Apex of Osmunda cinnamomea

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Superficial cells of the shoot apex of Osmunda cinnamomea adjacent to leaf primordia were examined with the electron microscope. In this region, a develop-mental interaction is known to occur between the shoot apex and prospective leaf cells. Numerous plasmodesmata were observed in the anticlinal and periclinal walls of these promeristem cells. It is suggested that the plasmodesmata might constitute a transport pathway for developmental influences passing from the promeristem to the leaf site.