Abstract
Long-distance transport in system and phloem of stems of arborescent monocotyledons takes place in primary tissues which must function throughout the life of the plant. Even though the vascular system of the stem forms a complex network, accidental embolism of xylem vessels cannot spread much, if it occurs anywhere, because vessels of cross connections (bridges) are of limited lenght. The path of phloem transport of C-labeled sugar has been plotted in a small palm stem with the shuttle microscope through a series of approximately 10,000 autoradiographs of transverse sections. It followed the complex vascular pattern which had been elucidated earlier with cinematographic analysis.
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