Fig. 117. Rubus villosus - Cross-section of root

showing bark attached to wood. (17 diam.) A. Cork. B. Medullary ray. C. Xylem. D. Water tube. E. Groups of bast fibers. (Photomicrograph.)

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