239 



The Pines of Australia. 



Figure 157. — Transverse section through the central stem and three 

 adnate leaves. The transpiratory surfaces are the level 

 areas between the curved dorsal apices. Three bundles are 

 seen corresponding to each leaf. C. Tasmanica, x 50. 



Figure 158, Transverse section through branchlet and decurrcnt leaves 



clear of oil cavities. The transpiratory surfaces are raarknd 

 by the letter S. C. Tasmanica. x 50. 



Figure 159. — Transverse section through branchlet and adnate leaves. 



No leaf bundles are seen, but endodermal cells and spongy 

 mesophyll are well defined. This is quite an uuusual form 

 for Callitris leaves C. Tasmanica, x 35. 



Figure 160. — Transverse section through branchlet and decurrent adnate 

 leaves, with an oil cavity in each leaf. Tlie transpiratory 

 surfaces are marked by the letter S. C. Tasmanica, x 50. 



Transverse sections of branchlets and leaves of C. Tasmanica, nobis. 



