



1920] 



LANGDON—DIOON SPIXULOSUM 



115 



Worsdell (12) also calls attention to the occurrence of peculiar 



resem 



vertical face of the wood and accompanying the bundles of the 

 large medullary rays of Macrozamia Fraseri, and also found among 



Fig. 2. — Transverse section of mature wood, showing foliar ray in center: 7\ longi- 

 tudinal section through upper part of leaf trace; X85. 



the parenchyma cells between successive vascular rings m Encepka- 

 lartos (13). These, however, are of a pitted type rather than of 

 the irregularly reticulated and scalariform types characteristic of 

 D. spinnlosum. 



The mode of connection of this trace with the secondary tibro- 

 vascular structures of the stem is as follows. Figs. 3, 4, and 5 are 



