Abstract: The authors find that there are vessels in the roots of Phyllids japonica Komarov distributed in the broadleaves forest of Changbai Mountain in the northeast of China. The conclusions are as follows: 1. There are. obvious vascular cambium and secondary, vascular tissue in the roots of P. japonica. The vessels exist in the secondary xylem. 2. The vessel is pitted. Its end walls are usually oblique, and horizontal one occasionlly occurs. All the vessels have simple perforations. There is alternate pitting on the walls, and often acuminate toward the end of the vessels. Its bordered pit is flat. The innerpart of the pit is lenticular, reaching horizontally the pit border boundary. Finally, there are clear spiral thickenings on the wall.

Key words: Phyllitis japonica, Secondary xylem, Pitted vessel of spiral thickening