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Welcome to the bark side.

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

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Gallery: 
Sayre 1917
Frangula

(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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