378 R. T. BAKER AND HENRY G. SMITH. 



the spongy parenchyma in the upper portion of the leaf over 

 the central vascular bundle, and beyond. Only one whole 

 oil gland comes into the field of vision. x 140. 



Plate XXIV. 

 Fig. 11. A cross section through the central bundle of a leaf and 

 surrounding tissue cut from the upper portion of the leaf. 

 Here the palisade parenchyma is in its normal position, and 

 the mass of sclerenchymatous fibres surrounding the central 

 bundle are distinctly seen. This section also shows clearly 

 the papillose projections of the cells of the cuticle on the 

 ventral surface, and these are the first so far met with in 

 Melaleucas. In a few of the spongy parenchyma cells cal- 

 cium oxalate crystals can be seen. x 225. 



Melaleuca pauciflora. 



Fig. 12. A cross section through a two-thirds portion of a leaf. 

 The bundle is normally orientated, the channel denoting the 

 upper or ventral surface, towards which it will be noticed 

 that the palisade parenchyma is more strongly developed 

 than on the dorsal surface. The oil glands it will also be 

 seen are not numerous. Here also as in M. gibbosa the 

 spongy parenchymatous cells bound the central bundle on the 

 dorsal side. Several bundles occur on the median plane of 

 the leaf texture, two at the extremities of the picture being 

 cut obliquely. Four crystal sacs occur in the palisade paren- 

 chyma of the upper surface towards the right, and in two, 

 rhomboidal crystals are well outlined. x 110. 



