(18 diam.) A, Cork. B, Thin-walled parenchyma of cortex. C, Xylem. D, Medullary ray. (Photomicrograph.)
This image is from Rhatany in Sayre's Manual of Organic Materia Medica and Pharmacognosy, 1917.

(18 diam.) A, Cork. B, Thin-walled parenchyma of cortex. C, Xylem. D, Medullary ray. (Photomicrograph.)
This image is from Rhatany in Sayre's Manual of Organic Materia Medica and Pharmacognosy, 1917.