Fig. 36. — Part of a transverse section of Honduras sarsaparilla root showing 
epidermis (e), root hair (ha), hypodermis (h), cortex (c), endodermis ( en ), peri- 
cambium (p), trachea of one of the numerous xylem patches (<), and pith (m). 
The phloem patches are the small oval cellular areas wedges in between the outer 
portions of adjacent xylem masses. (Photomicrograph.) 
xylem alternating with four phloem patches. These roots have an 
unlimited power of growth. 
A. Of Primary Growth. 
A trans-section of a dicotyl root in its young growth shows the 
following structure from periphery toward center: 
PLANT ORGANS AND ORGANISMS 89 
7. Medulla or pith composed of parenchyme cells containing starch 
and often showing xylem patches cut off and enclosed within it. 
Dicotyledons. — The typical dicotyl root is a tetrarch one, four 
