1016] UOFFSTADT— PIPER METHYSTICUM 123 



early becomes lignified (figs. 13, 14). Later, owing to growth of 

 the bundles, this band is broken and patches appear only at the 

 inner portions of the bundles (fig. 18). 



Fig. 12. — Detail of double bundle with xylem points outside; X820 



The pericycle consists of only a few cells (fig. 16) just outside 

 the bundles in both the peripheral and pith systems, and nowhere 

 else. It can be distinguished easily in the young stems by the 



