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