LEAVES. 



89 



PLATE XXXVIII. 



FIG. 48. Powdered Tea (x 240). 



cr, Crystals. 



ei, Lower epidermis. 



en, Neural epidermis. 



ep, Apex of marginal tooth. 



es, Upper epidermis. 



flV, Debris of flbrovascular bundles. 



I, Bast with cluster crystals. 



m, Spongy parenchyma. 



p, Simple hairs. 



pa, p'a', Palisade cells. 



per, Pericycle, slightly lignifled. 



sc, Idioblasts from the mesophyll and cortical tissue. 



s'c', Idioblasts from the pith of the stem. 



tf, Cortical tissue. 



tr, Tracheids. 



vl, Vessel. 



