43 



The Pines of Australia. 



Figure 16. — Transverse section through the base of a very young cone. 

 In this case the six valves are separated internally at 

 this period, except at the outer edge. All the cavities are 

 oil cells. C. Madeayana, x 15. 



-Longitudinal section through the dome of seed cavitv, 

 showing the junction of ventral surfaces of two sporophylls 

 to form a roof over the fertilised seeds or zygotes. A 

 spur is well shown on the right. A feature is the row of 

 oil glands (white) backed by an uneven row of bundles 

 (dark patches}. C. rhomboidea, x 13. 



Figure 17. — Transverse section through the junction of two valves of 

 Figure iG. The papiUose projections (now teeth-like) 

 of the ventral surfaces of the sporophylls, which close 

 the separating space to the outer world, are clearly seen, 

 as also are the oil glands. The smaller bodies are 

 parenchymatous cells. C. Madeayana, x 55. 



Figure 19. — Longitudinal section through the early stage of cone for- 

 mation, the space containing the fertilised ovules being 

 now quite a complete cavity. C. rhomboidea, x 13. 



Sections to illustrate the life history and anatomy of the Cone Valves, 



