(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.

(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.