45 



The Pines of Australia. 



Figure 20. — Long:itudinal section through the dome of the early fruit, 

 showing the junction oi sporophyll enlargements and 

 so forming the seed cavity; the white spaces close to the 

 ceiling of the dome are oil cavities, and the£e are backed by 

 a row oi bundles, — the darker patches. C. rliomboidea^ x id. 



Figure 22. — Longitudinal section through the columella and adjacent 

 zygotes at the bottom of the cavity. C. rhomboidea, x 20. 



Figure 21. — Longitudinal section through the dome of the cavity, but 

 clear at the base of the central axis of the branchlet. The 

 columella is well seen separating the two central fertilised 

 ovules. The material has broken away in the left of the 

 picture. C. rhomboidea, x 8. 



Figure 23. — Longitudinal section through the early cone and clear oi 

 basal- axis, showing fertilised ovules completely enclosed by 

 the sporophylls. The columella is triangular in shape and 

 empty, and has a perfect fertilised ovule on the right. 

 C. rhomboidea, x 8. 



Sections to illustrate tlie life history and anatomy of the Cone Valves. 



