336 
ILL USTRA T10NS. 
Plate VI. 
VARIOUS FORMS OF SCLERENCHYMATOUS FIBERS. 
Fig. 43. — Intermediate fibers from wood of ipecacuanha showing 
bonified walls with oblique simple pores and one cell 
containing starch. 
Fig. 44. — Bast fibers from cinchona showing in transverse section 
a stratification of the wall, the isolated fibers showing 
striation of the walls. 
Fig. 45. — Tracheids of quassia showing bordered pores and frag- 
ments of medullary-ray cells. 
Fig. 46. — Intermediate fiber of gentian, the w'alls consisting of 
cellulose and having simple oblique pores. 
Fig. 47. — Transverse section of a group of bast fibers in quercus 
alba, and a few crystal fibers. 
Fig. 48. — Portions of two bast fibers from krameria. 
Fig. 49. — Sclerenchymatous fiber from leaf of uva ursi. 
Fig. 50. — Portion of modified bast fiber of euonymus. 
Fig. 51. — Portions of bast fibers and a crystal fiber of quercus alba. 
Fig. 52.— Portions of sclerenchymatous fibers of quillaja showing 
unequal thickening. 
Fig. 53. — Portion of bast fiber of the root of a species of Gossypium. 
Fig. 54. — Isolated sclerenchymatous fiber of zingiber. 
