2o6 



PLANT ORGANS OR PARTS OF PLANTS. 



Fig. 55. — Tea Leaves. 

 I, Portion of leaf showing the teeth and nerves. II, Cross-section 

 young tea leaf: Ep, Epidermis of upper side; Ep\ of lower side; p, 

 palisade cells; S, mesophyll; K, crystals; J, stone cell. Ill, Cross-sec- 

 tion young tea leaf, showing in addition, t, hair. IV, Epidermis, upper 

 side. V, Epidermis from under side, showing sp, stomata; p, paren- 

 chyma.^ VI, VII, VIII, IX, Stone cells and parenchyma with, a, peculiar 

 thickenings. X, Hairs and base of hair. XII, Fragment of gland 

 (Vogl). 



