1. Cytokinesis is considered in two phases, 1) the bipartition of the cytoplasm of the mother cell by the development of phragmoplast, and 2) the MLI formation by which the bipartition of the entire cell-body is effected.2. The processes whereby the remains of the phragmoplast is dissolved in the cytoplasm are described.3. The substance of the remains of the phragmoplast is not transformed directly into the plasma membrane. The plasma mem-brane lining the MLI is that of the cytoplasm which migrated through the remains of the phragmoplast toward the MLI, and spread over its surface.4. In the cytokinesis of PMC the plasma furrow is preceeded as a rule by the MLI formation otherwise by the complete phragmoplast formation across the equator.5. So-called wall protrusion of the inner lamella of the PMC is the result of the secondary and tertiary callose accumulation in the ist and 2nd cell divisions of PMC, produced after the completion of MLI, namely after the bipartition of the mother protoplast so that the wall protrusion cannot be the cause which leads to the cytokinesis of the PMC.Here let me express my hearty thanks to Prof. K. Fu ir who has encouraged me throughout the course of this study, and has given me much advice.
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