LEAVES. 



75 



PLATE XXXI. 



FIG. 41. Powdered Mate, or Paraguay Tea (x 240). 



ccr, Crystal cells containing both cluster crystals and prisms. 



cr, Calcium oxalate crystals. 



co t Collenchymatous cells. 



ei, Lower epidermis. 



en, Neural epidermis. 



es, Upper epidermis. 



flV, Fragments of flbrovascular bundles. 



fp, Pericyclic fibres, lignified. 



I, Bast. 



m, Stellate cells of mesophyll. 



p, Unicellular conical hair. 



pa, p'a', Palisade cells. 



st, Stomata, surrounded by a circle of cells. 



s't', Water pore. 



tf , Cortical tissue of the midrib with numerous cells. 



tr, Tracheids and vessels. 



