LEAVES. 



77 



PLATE XXXII. 



FIG. 42. Powdered Orange Leaves (x 240). 



c.cr, Cells with crystals (from the palisade tissue). 



cr, Crystals of calcium oxalate. 



ei, Epidermis of under surface. 



en, Epidermis over the veins. 



es, Epidermis of upper surface. 



f , Lighified pericyclic fibres. 



f , Fibrous cells from small vein. 



ffv, Fragments of fibrovascular bundles. 



I, Bast. 



me, Cells of spongy parenchyma. 



p'a', Palisade cells, 



st, Stomata. 



t, Tracheids. 



tc, Cells with crystals (abutting on the lignified fibres of the pericycle). 



tf , Cortical parenchyma of midrib. 



