342 



LEAF OF TAXUS 



198, ep.) shows the thick cuticle and sunken stomata (Fig. 198, B) 

 associated with transpiration-reduction ; the pronounced papilke 



B. 



FIG. 198. A-D, Structure of the leaf of the Yew (T ax us b ace at a) in transverse 

 section. A, Diagram of whole section; B, single stoma enlarged; 

 C, central part of transverse section ; D, a few cells of the transfusion 

 tissue, b., bundle ; ep., epidermis ; p., palisade tissue ; ph., phloem ; 

 s., spongy tissue ; St., stomata ; t., transfusion tissue ; xy. t xylem. 

 E, Tangential longitudinal section of leaf of Pinus, showing a resin - 

 canal (r.c.) and the transverse lamellae of assimilating cells. 



on the lower surface (Fig. 198, B, C) are a special peculiarity. 

 The mesophyll, comprising two layers of palisade cells (p.) and 



