570 IOWA ACADEMY OF SCIENCE 



SEQUOIA SEMPERVIRENS Endl. Red Wood. 



Leaves (secondary and lower branches) flat, lanceolate, *4 to V2 

 inch long. 



Kesin ducts 3, lined with unlignified cells. 



Vascular bundle one. No bundle sheath. Cells adjoining bundle 

 slightly lignified. 



Hypodermal cells present along upper surface and extending 

 around edges of leaf to resin ducts, lignified and thick 

 walled. 



Epidermal cells not lignified. 



Stomata on dorsal surface in 2 narrow bands, ventral surface 

 stomatiferous on each side of midrib. 



Material from University of California. 



Plate LXIII. 

 Figure 1. — Section of leaf of Sequoia sempervirens. 



Figure 2. — Section through upper epidermis of leaf of S. 

 sempervirens. 



Figure 3. — Section through lateral resin ducts of leaf of S. 

 sempervirens. 



Figure 3 (lower). — Section showing stoma and underlying 

 parenchyma of S. sempervirens. 



Figure 4. — Section through vascular cylinder and central 

 resin duct of leaf of S. sempervirens. 



