566 IOWA ACADEMY OF SCIENCE 



ABIES NOBILIS Lindl. Red Fir. 



Leaves flat and deeply grooved above, on sterile branches; 4- 

 angled on fertile shoots. U inch to iy 2 inches long. 



Resin ducts lateral, touching ventral epidermis, lined with 2 

 layers of unlignified cells. 



Vascular bundles surrounded by a bundle sheath of round, 

 loosely joined cells: cells below phloem lignified. 



Hypodermal cells present in lateral angles of leaf and along 

 dorsal and ventral midribs in 1 to 2 layers, cells thick walled 

 and lignified. In the 4-angled leaves they are more or less 

 present around entire periphery. 



Stomata present on both surfaces. 8 rows on upper surface and 

 10 rows on lower surface. 



Material from Herbarium. Iowa State College. 



Plate LXI. 

 Figure 1. — Section of leaf of Abies nobilis. 



Figure 2. — Section through epidermis and stoma of A. no- 

 bilis. 



Figure 3. — Section through resin duct of leaf of A. nobilis. 



Figure 4. — Section through vascular cylinder of leaf of A. 



nobilis. 



