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Behnke (1963) has recently described a helical a r rangement of ribosomes in differentiating cells of the small intestine of the rat fetus, and Waddington and Perry (1963) have found the same structures in the muscle cells of Rana pipiens embryo. In the course of an investigation into the development of pollen in Ipomoea purpurea (L.) Roth, a similar ar rangement of ribosomes has been seen in the differentiating pollen mother cells. I t is the purpose of this study to describe these structures which have not previously been found in plant tissue.

AN APPARENT HELICAL ARRANGEMENT OF RIBOSOMES IN DEVELOPING POLLEN MOTHER CELLS OF IPOMOEA PURPUREA (L.) ROTH