4 8 4 



STUDIES IN FOSSIL BOTANY 



scattered, dark groups of sclerotic tissue, such as we 

 find in the pith of L. oldhamium. 



The most characteristic feature of Lyginodendron, 

 however, namely the strands of primary wood on the 



_£C' 



Fig. 178. — Cycadoxylon rolmstiim. Part of transverse section, showing inner portion of 

 normal wood, with two anomalous zones of wood and bast. _r 2 , normal secondary 

 wood ; x^ypjft, first inverted band of medullary xylem and phloem ; .r 4 , /A 4 , second 

 band of the same ; /, pith. X 12. S. Coll. 457. (G. T. G.) 



border of the pith, cannot be recognised with certainty 

 in Nield's specimen, and if present, must, it would 

 seem, have been much reduced. The remains of leaf- 

 traces, passing out through the secondary wood, are 

 seen at several places, but even here the primary xylem 

 of the outgoing bundle has not been detected, It must 



