XV] 



LEPIDODENDRON 



165 



xylem, x' , occur several isodiametric tracheae with fine scalariform 

 and reticulate thickening bands like those in the central region 



D 



B 



C rnr 



»:k( 



Fig. 181. Lepidodendron WUnschianuin. Calciferous Sandstone, Dalmeny. 

 (A, Sedgwick Museum, Cambridge. B — F, Botany School, Cambridge.) 



