538 IOWA ACADEMY OF SCIENCE 



PICE A SITCHENSIS Carr. Sitka Spruce. 



Leaves flat. 1 2 inch to l 1 - inches long. 



Resin duets none. 



Yascular bundles — Xylem not apparently separated, cells of 

 pith above xylem and below phloem lignified. lignified 

 strengthening cells present below phloem, bundle sheath some- 

 what lignified. 



Hypodermal cells lignified. in one layer except at lateral edges 

 of leaf and in dorsal and ventral angles where there is an 

 increase of 2 to 3 layers. Thinner walled hypodermal cells 

 below epidermis between the angles of the leaf on ventral 

 side. 



Parenchyma walls deeply corrugated. 



Stomata occasionally in 2 to 3 rows on each side of midrib on 

 lower surface, numerous stomata on upper surface. 



Materials from University of Washington and from State House 

 grounds. Sacramento. California. 



Plate XLYII. 



Figure 1. — Section of leaf of Picea sitchensis. 



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

 P. sitchensis. 



Figure -i. — Section through vascular cylinder of leaf of P. 

 sitchensis. 



