The Pines of Australia. 



Group III. 



Cross Section through dccurrent leaves and branchlet of C. Dnoninoiuiii, 



X 40. Sclercnchj'matous cells are here seen distributed tliroughout Ihe 



wli.ole raesophyll tissue and cut at various angles. The transfusion 



tissue is not a strong feature. Stained with lismatoxylin. 



Cross Section through branchlet and base of decurrent leaves ia 



C. Macleayana, x 280. This illustrates the encircling of the central 



axis by numerous sclerenchymatous cells. Only a few transfusion 



tracheids are seen. Stained with hematoxylin. 



Leaf anatomy illustrating the arrangement of Species in Table, 



of the Callitris. 



-The probable evolution 



