250 CHANDLER—AERIAL Roots. 
Nxe-” #5) Further stage of the same. zc, inner cambiu 
Fic. 16. Portion of 14 more highly magnified, Siveicas possible initials of branch 
att, tr 
Fic. 17. Normal origination of a rootlet from pericyc 
Fic. 18. Lobe of a split root showing dorsiventral structure. ic, inner cambium 
which afterwards complete the <eee system ring. 
Fic. 19. A later stage of features seen in Fig 
Fic. 20. Still later stage than 19. 
- Completed lobe resulting from splitting of root. The vascular rings show 
no difference on the two sides, yet the one side is derived from the 
vascular ring of the primary aerial root. The other is formed from the 
inner cambium 
by 
— 
i) 
ts 
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