Intercalary Growth in the Aerial Shoot of Eleocharis acuta R. Br. Prodr.: I. Structure of the Growing Zone1

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Abstract
The numbers and distribution of cell division and the cell lengths have been determined for the various tissues in the intercalary meristem of Eleocharis acuta R. Br. Prodr. Cell divisions are most numerous in the chlorenchyma tissue and fewest in the plate parenchyma. In all tissues examined except the plate parenchyma, cell length is inversely correlated with numbers of cell divisions. The cell divisions which occur in the vascular tissue in the intercalary meristem are regarded as being a part of the intercalary growth and not as a normal development of a procambium. Mature xylem and phloem are seen to be present in the larger vascular bundles right through the meristematic zone, and the xylem trachieds are shown to be conductive. The transverse strands connecting adjacent vascular bundles are considered to be important in the conduction of water.