560 IOWA ACADEMY OF SCIENCE 



ABIES LASIOCAEPA Nutt. Balsam Fir. 

 Leaves flat, 1 inch to 1% inches long. 



Resin ducts large, interparenchymal, and lateral; lined by 2 

 rows of thin cells. 



Vascular bundles small and near upper margin of vascular cyl- 

 inder. The large loose cells below phloem are lignified. 



Hypodermal cells present below epidermis at lateral edges, and 

 between the bands of stomata on lower surface. Inner Avails 

 of epidermis lignified. 



Stomata present, in 4 to 5 rows each side of midrib on dorsal 

 side and 7 to 8 rows each side of midrib on ventral side. 



Material from Jamaica Plains, Massachusetts. 



Plate LVIII. 



Figure 1. — Section of leaf of Abies lasiocarpa. 



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

 A. lasiocarpa. 



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

 lasiocarpa. 



