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SCIENTIFIC AND APPLIED PHARMACOGNOSY 



yellowish-brown caoutchouc-like content; inner bark of long, narrow 

 wedges of phloem separated by the medullary rays, from 1 to 2 

 cells in width and from 10 to 20 rows in depth; phloem consisting of 

 small groups of leptome separated by bast parenchmya containing 

 starch, and intermixed with yellowish-brown latex cells; the latter also 

 occurring in the medullary rays. In longitudinal section the caout- 

 chouc fibers are frequently separated in the form of long, somewhat 



FIG. 175. Euonymus atropropureus: A, flowering branch showing a distinctly 

 petiolate leaf. B, cluster of the smooth capsular fruits. E, americanus: 

 C, fruiting branch showing the opposite almost sessile leaves and axillary ver- 

 rucose capsule. D, cross-section of stem showing a stoma sunk beneath 

 the epidermis. E, cross-section of stem showing epidermis (e), hypodermis 

 (h), palisade cells of cortex (p), parenchyma cells (pa), pericycle (s) and 

 portion of the leptome (1). After Holm. 



twisted, curved fibers, from 0.010 to 0.015 mm. in thickness, having 

 highly refracting colorless walls and usually contain a yellowish- 

 brown caoutchouc-like substance. 



Powder. Light brown; bast fibers very long, having thin, 

 non-lignified, porous walls, and frequently associated with long 

 caoutchouc fibers, which are soluble in ether and chloroform ; starch 



