135 



The Pines of Australia. 



Figure 73. — Transverse section through the opened edges of a decurrent 

 channel, showing the relative position of the papillose 

 projections to the stomata. Two pairs of guard cells 

 being shown. C. glauca, x i6o, 



Figure 74. ^Transverse section through closed edges of a decurrent chaimel, 

 and showing structure in that part of the leaves. A stoma 

 with its two guard cells is shown on the left. C. glauca, 

 X i6o. 



Figure 75. — Transverse section through the leaf in the location of the 

 base of an oil cavity, with secretory cells and leaf bundle 

 with phloem marked by- the black patch. The transfusion 

 tissue is clearly indicated by the smaller circles (bordered 

 pits) in the individual cells. The papillose projections 

 are sho\vn on the lower left edge of the picture. C glauca, 

 X i6o. 



Figure 77.— A longitudinal section through a branchlet and decurrent 

 leaves at the base of the whorl. An oil cavity is shown 

 iii_situ in the left leaf. C. glauca, x 55. 



Sections of different parts of leaves of C. glauca, R.Br. 



