XV] 



LEPIDODENDRON 



155 



B 



Fig. 174. I,cpidodendron aculeatum. 

 (Cambridge Botany School.) 



secondary cortex; at c a second meristem i.s seen in the outer 

 cortex : the dark dots in the cortex mark the positions of leaf- 

 trace bundles. The inner cortex, d, is a more compact tissue 



Fig. 175. Lepidodendron aculeatum. 

 (Cambridge Botany School.) 



