."5 



LAXGDOX—DWOX SPIXULOSl'M 



IQ20 



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

 irregular tracheids resembling "transfusion-tissue" on the interior 

 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: T, longi- 

 tudinal section through upper part of leaf trace; X85. 



the parenchyma cells between successive vascular rings in Encepha- 

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

 the irregularly reticulated and scalariform types characteristic of 

 D. spinulosum. 



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

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



