5«8 IOWA ACADEMY OF SCIENCE 



ABIES MAGNIFICA A. Murr. Red Fir. 



Leaves 4-angled, % inch to iy 2 inches long. 

 Resin ducts, large, lateral, touching epidermis on ventral side, 

 lined by 2 layers of unlignified cells. 



Vascular bundles large and close together. Vascular cylinder 

 not surrounded by a definite sheath ; 2 large groups of ligni- 

 fied cells present each side of phloem. 



Hypodermal cells thick walled and lignified, located in lateral 

 angles, dorsal angles, and adjoining resin ducts, also scattered 

 in groups of 2 and 3 along ventral side of leaf. 



Stomata in bands of 6 to 8 rows on each of the four sides of the 

 leaf. 



Material from Jamaica Plains, Massachusetts. 



Plate LXII. 

 Figure 1. — Section of leaf of Abies magnified. 



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

 A. magnified. 



Figure 3. — Section through resin duct of leaf of A. mdg- 

 nifica. 



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



nni unified. 



