Later stage of cell plate formation

Primary cellulosic cell wall is then deposited on both sides of cell plate

Two adjacent daughter cells are seen with large nuclei containing prominent nucleoli as dark central bodies. The cell plate site extends between the nuclei from upper left to lower right as a series of sharply defined flattened vesicles.

The vesicles which are laterally fusing polymerize pectic substances, which are later replaced by cellulose and augmented with other primary wall materials. The discontinuities in the cell plate include sites of plasmodesma formation. Note two dictyosomes (arrows), which are producers of secretory vesicles that laterally fuse to give rise to the cell plate.