Intercalary growth in the aerial shoot ofEleocharis acutaR. BR

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Abstract
The development of the intercalary meristem which produces the main internode of the haulm of Eleocharis acuta R. Br. has been examined from its inception to the maturity of the internode. Most of the differentiation of tissues is basipetal but a small region of basifugal differentiation occurs at the base of the internode. The various tissues become distinguishable within the region where cell divisions occur. Elongation is due mainly to cell division until the internode is several millimetres long. and then to both cell division and elongation until cell division ceases at about two-thirds of the mature length. The final third of elongation is due to cell elongation alone. Cell division is greatest in rate and extent when the haulm is approximately one-third of its mature length. Both rate and extent of cell divisions are greatest in the chlorenchyma tissue and least in the place parenchyma. In general the features of the intercalary meristem in E. acuta conform to those of other species.