PLATE LVIII. 



Fig. 27. Sheath of midrib near tip. x 292. Differentiation of border 

 parenchyma (I) into stone cells (j). 



Fig. 28. Extreme tip of midrib sheath, x 292. 



Fig. 29. Drawings of leaf veins with border parenchyma. X 292. 



Fig. 30. Ultimate endings of leaf veinle^s in groups of spiral tra- 

 cheids. X 292. 



Fig. 31. Cross section of leaf base. X 63. k, upper epidermis; r, 

 palisade tissue; m, lateral veins; i, spongy parenchyma; j. phloem of 

 midrib; /, xylem of midrib; p, lower epidermis. 



Fig. 32. End of tracheal tube. X 618. 



Fig. 33. Cross section of midrib from figure 31. X 292. a, xylem; 

 b, phloem. 



Fig. 34. Bast fiber. No pits visible. X 292. 



Fig. 35. Cross section of leaflet petiole. X 292. c, starch-containing 

 cells; d, stone cells; e, phloem; /, xylem. 



Fig. 36. Water-storage tissue under midrib of leaf. X 3-50. 



Fig. 37. Cross section of xylem in midrib, x 1233. g, tubes; h, wood 

 parenchyma. 



Fig. 38. Cells of sclerenchyma sheath. X 618. 



Fig. 39. Group of tracheids from leaf. X 292. 



Fig. 40. Row of tracheids from leaf. X 292. 



