1946 年 59 巻 697-702 号 p. 92-95
1) An anomalous structure other than“successive rings of wood and bast”was found in the tap roots of Cycas Rumphi Miq. f. undulata Kanehira. This anomaly. as seen in the transition region, is represented by two sets of bundles enclosed within a common vascular ring (Fig. 3, 1′): but the structure in question passes on gradually, in upward and downward directions, to the normal structure in the way indicated in Fig. 3.
2) Leaf-traces for a leaf vary much in number in early formed leaves, but the leaves formed later are provided constantly with two leaf-traces.