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Welcome to the bark side.

Fig. 235. Cross-section of bark of Viburnum opulus.

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Gallery: 
Sayre 1917
Viburnum

(X 43). A, Cork. B, Cork cambium. C, Parenchyma of cortex. D, Phloem. E, Medullary ray. F, Group of stone cells.

This image is from Cramp Bark in Sayre's Manual of Organic Materia Medica and Pharmacognosy, 1917.

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