43^^ 



BOTANICAL GAZETTE 



[DECEMBER 



in this species, occurring in nearly half the specimens in our posses- 

 sion. It would thus appear that the species was very easily stimu- 

 lated to the formation of traumatic resin ducts. 



The pith is not well shown in fig. i on account of the partial decay 

 of the specimen. In fig. j it appears more clearly^ and it is possible 

 to distinguish that there are certain dark areas in it, which correspond 

 to islands or nests of sclerotic cells, similar to those w^hich are found 

 in the medulla of the Cretaceous genus Brachyphyllum. The pith 

 is relatively large in size, exceeding in its proportions that found in 

 living Cupressineae. Fig, j, which was made 



from 



fig 



small 



in situ. In the cortex are present, although this feature is not appar- 

 ent in the figure, the same islands or nests of sclerotic tissue which 

 are found in the medulla. 



Fig. 2 shows the cross-section of another less well-preserved 

 stem, which has lost part of its woody tissues, but still retains a 

 considerable portion of its bark. The apparent cracks in the wood 

 represent rows of resin canals, which the magnification is not sufficient 

 to make apparent. Fig. 4 illustrates a part of the 



same 



figs. I and J, under a higher ma 



The row 



made 



also the sclerifications, which appear as dark spots in the pith. 



Fig. 5 shows a portion of the section figured in fig. i, under a 

 considerable degree of magnification. The absence of resiniferous 

 cells, such as are a feature of the wood of the Cupressineae, can 

 be made out. A number of rounded a 

 which are the traumatic resin canals. 



m 



their rounded contour 



resemble 



of any other of the Cretaceous Araucarineae which w^e have studied. 

 The resin canals are surrounded by one or more layers of parenchyma 

 cells, which appear to be devoid of contents. Often there is present 

 in the lumen of the canals themselves a dark-hued substance, which 



mucila 



numerous 



paring the material for sectioning. This substance apparently 

 corresponds to that described as present in the traumatic resm 



