The Pines of Australia. 



Group I, 



Cross Section through decurrent leaves and branchlet of C. propingua. 



X 70. No sclerenchymatous cells are seen. Very faintly stained with 



hfematoxylin. 



Cross Section through the ventral portions of decurrent leaves and 

 branchlet of C. areiiosa. x igo. No sclerenchymatous cells are seen. 

 The dark-brown contents of certain cells is the manganese cornpound. 

 The cells with small circles (pits) in them, mark the tracheids of the 

 transfusion tissue. Stained with h^ematoxylin and safranin. 



Leaf anatomy illustrating the arrangement of species in Table,- 



of the Callitris. 



The probable evolution 



