Abstract
Accurate and plain maps on the vascular bundles of the dwarf part of stem inthe rice plant are illustrated in fig. 1 and 2. The vascular network of the dwarf part of stem presents striking similarity to that of the elongated part of stem on the point of histogenic view. In the swelling elliptical leaf traces of the dwarf part of stem as well as the elongated part of stem, trachieds and xylem parenchyma, containing xylem transfer cells, display a mosaic structure. But, no phloem transfer cell has been found throughout the entire stem. When a leaf is emerging out, the swelling elliptical portions of the leaf traces elaborate their xylem structure, in which xylem parenchyma and transfer cells absorb solutes from transpiration stream and send them toward the shoot apex. This function of the swelling xylem structure was verified by the distribution in the stem of barium absorbed through the roots. The vascular bundles of the stem are classified in which these types, from fig.6, in which these types, from fig.6-1 to fig.6-5, have gradually increasing efficiency with regard to horizontal transport
