562 IOWA ACADEMY OF SCIENCE 



ABIES CON CO LOR Lindl. and Gord. White Fir. 



Leaves flat, straight, 2 to 3 inches long. 



Resin ducts ventral, touching epidermis; lined with 2 layers of 

 cells; not lignified. except where ducts touch epidermal wall. 



Vascular bundles very far apart, cells between lignified, no trace 

 of a bundle sheath. 



Ilypodermal cells present on lateral edges and on lower side of 

 leaf between bands of stomata. 



Guard cells and heavy cells in epidermis above them lignified. 



Stomata in 6 to 7 rows each side of midrib above, in 

 5 to 6 rows each side of midrib below. 



Material from Campus of Iowa State College and from 

 Jamaica Plains, Massachusetts. 



Plate LIX. 



Figure 1. — Section of leaf of Abies concolor. 



Figure 2. — Section through epidermis and stoma of leaf of 

 A. concolor. 



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



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

 concolor. 



