PLATE LVI. 



Fig. 8. Tangential section of stem through chlorophyll region. X 618. 

 b, chloroplasts; s, nucleus. 



Fig. 9. Longitudinal section of stem. x 292. x, spiral tracheal 

 tubes; w, row of pitted tracheids; o, phloem; i, sclerenchyma sheath; f, 

 bast fibers; u, epidermis; v, chlorophyll cells. 



Fig. 10. Crystals from stone cells, x 618. 



Fig. 11. Tangential section of stem through two groups of bast 

 fibers. X 292. w, j, bast fibers ; k, overlapping of ends of fibers ; y, stone 

 cells ; z, lignified parenchyma. 



Fig. 12. Bast fiber with m, straight pit. X 292. 



Fig. 13. Special bordered pits in ti'acheids. t, pit-like sti-ucture. 

 X 618. 



Fig. 14. Epidermis of leaf. X 350. 



Fig. 15. Trichome from leaf. X 350. c, papilla; d, core-like center. 



Fig. 16. Stoma, cross section of leaf. X 618. p, air space; q, guard 

 cell. 



Fig. 17. Epidermis of leaf, showing cutinization by heavy line. 

 X 292. n, upper surface; o, lower surface; p, lower surface under midrib. 



Fig. 18. Sieve tubes from phloem. 6, sieve plate. X 618. 



Fig. 19. Overlapping of tracheids in rows. X 618. 



