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Fig. 171. Rhamnus purshiana - Cross-section of bark.

Gallery:

(20 diam.) A, Cork. B, Group of bast fibers and stone cells. C, Medullary ray. (Photomicrograph.)
This image is from Cascara sagrada in Sayre's Manual of Organic Materia Medica and Pharmacognosy, 1917.



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