Fig. 91. Podophyllum in powder.
Starch. Cryst, Crystals of calcium oxalate. Ck, Corky tissue, side view. PD, Duct with bordered pores. RV, PV, Reticulated and pitted ducts. Tr, Tracheids. SV, Spiral vessels. W.F, Wood fibers or bast fibers. Par, Parenchyma in longitudinal view. P. Parenchyma in cross-section. (After Jelliffe.) This image is from Podophyllum in Sayre's Manual of Organic Materia Medica and Pharmacognosy, 1917.