Summary: Elongation of the stipe was investigated in . The cell lengths in premarked regions of the stipe from base to top were compared. They were also compared with total stipe expansion and with the expansion occurring within the premarked regions. Cell elongation accounted for the elongation of the lower and mid-regions of the stipe but could not account for the elongation of the upper stipe region. Using autoradiography it was shown that there was a non-polar addition of new wall materials in the elongating cells of the stipe and, particularly in the upper stipe, cell division could be seen to occur by the formation of new septa. A model for cell growth in the elongating stipe of is described.


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