51 



The Pines of Australia. 



O^ 



Figure 36.— Longitudinal section through a st3ge of a ccne formaticn, 

 showing Ihe roofing over of the fertiliied and sterile ovules 

 by the inner growth at lower portion of the sporophylls. 

 C. rhomboidt'ij, x 13. 



Figure 37. — Longitudinal section' showing the'^unction of the expanded 

 portions of tw-o sporophytls which form the dome of the 

 seed cavity. Oil cavities backed by a row of bundles are 

 seen near the inner surface. C. rhomboidea, x 13. 



Figure 39. — Longitudinal section cut obliquely through a later stage 

 of growth of cone than in Figure 3S. One spur is shown to 

 the right. C. rhomboidea, x 13. 



Sections illustrating the growth of the ventral side of the sporophylls, until a dome is formed over 



the zygotes. 



