The Pines of Australia. 



Figure 224-. — A cross section taken through a little more than half a leat, 

 the top being the dorsal surface, where it can be seen the 

 hypoderraal cells are a distinct feature, and which are 

 packed at the edge of the leaf. In the transpiratory surface 

 (lower portion) they are quite wanting, but a few large ones 

 can be detected scattered in the lower spongy parenchyma. 

 , The palisade layers, whilst a feature of the assimilatory 



surface, do not occur on the ventral side. The median 

 bundle is normally orientated, the phloem staining a darker 

 colour than the xylem. The endodermal cells surround an 

 oil cavity as well as the bundle. Stained with hematoxylin 

 and safranin. Athrotaxis selaginoideSy x 62. 



y -/Am. 







'VH 



Figure 225. — A cross section through the median area of a leaf, showing 

 in this part of the foliar structure the characters and organs 

 as detailed above in Fig. 224. The endodermal cells, as 

 well as the phloem and xylem of the central bundle, are 

 very clearly defined. Stained with hematoxylin and 

 safranin Athrotaxis selaginoides, x 60. 



