XV] 



LEPIDODENDRON 



143 



and L. Harcourtii and the protoxylem elements occupy an 

 exarch position. Isodiametric reticulately-pitted elements are 

 met with both on the inner and outer edge of the xylem. 



Fig. 162. Lepidodendron fuliginosum. Part of the stele in transverse section. 

 (Binney Collection, Sedgwick Museum, Cambridge.) 



Fio. 163. LepidodendronfuUginosum. Longitudinal section. 

 (Binney Collection, Cambridge.) 



