Abstract
The endoplasmic reticulum (ER) in immature sieve elements of Cucurbita maxima Duchesne resembles that of other types of nucleate cells in morphology and distribution. In mature sieve elements the ER assumes two forms. One of these is represented by a network closely applied to the plasma membrane lining the cell wall. The other consists of stacked membranes. The second form, which occurs next to the wall in various regions of the cell, is encountered only occasionally. The netted parietal ER is possibly continuous through the sieve-plate pores and may be associated with the plasmodesmata connecting the sieve element with the companion cells.
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