The Pines of Australia. 



323 



Figure 239. — Transverse section through abnormal leaf. The concave 

 surfaces are transpiratory, and the convex dorsal, assimi- 

 latory. Four oil cavities are shown. A. Cunnrnghamii, 

 X 50. 



S^ w 



Figure 230. — Transverse section through bundle of normal leaf, showing 

 the crescent shape of the xylem portion and individual 

 masses of phloem separated by medullary cells. Endodermal 

 cells are well defined, ibut no ^transfusion tissue is seen. 

 A. Ctoinin%hamii, x 190. 



Fisure 231 - Transverse section of normal leaf showing the packed 

 hypodermal cells marking the assimilatory outer surface 

 and (at top) several oil glands with the usual secretory 

 cells, the three central ones being subtended by a bundle. 

 A. Ciiiin'.nghamii, x 47. 



Figure 232. — Similar section to but higher _yp than Figure 231, and 

 showing the contour of the cross section at this part. A. 

 Citiiniiighamii, x 40. 



Sections of leaves of Araucaria Cunninghamii, Ait. 



