PLATE LVI. 



Fig. 15. Cross section of stem showing distribution of mucilage, 

 X 75: m, mucilage cells. 



Fig. 16. Oblique section of stem showing distribution of mucilage, 

 X 70: e, pocket where mucilage has dropped out; d, pocket containing 

 mucilage. 



Fig. 17. Cross section of stem showing distribution of crystals of 

 calcium oxalate at a, X 20. 



Fig. 18. Wood fiber, x 120. 



Fig. 19. Crystals of calcium oxalate, X 375. 



Fig. 20. Starch grains in stem, x 375. 



Fig. 21. Starch grains in root, X 375. 



Fig. 22. Cross section of petiole of leaf, X 70: a, vascular bundle; 

 b, parenchyma of the cortex; c, collenchyma; d, glandular hair; e, 

 epidermis. 



Fig. 23. Vascular bundle of petiole, X 275: a, phloem; b, tracheal 

 tubes. 



