156 STUDIES IN FOSSIL BOTANY 



leaf fell off, the broken ends of these two parenchy- 

 matous strands appeared on the scar, with the print 

 marking the bundle between them (see Fig. 62, showing 

 the leaf-bases of a Lepidophloios in tangential section). 

 The two external prints on the surface of the leaf- 



A 



Fig. 62. — Lepidophloios, sp. A. Tangential section from the outside of a stem, passing 

 through the leaf-bases, and showing their characteristic form. Slightly enlarged. B. 

 A single leaf-base, to show details, v.b, collateral vascular bundle ; pa, the two 

 parichnos-strands ; lg, ligule in its pit. X 10. Will. Coll. 1974 A. (G. T. G.) 



cushion below the scar (see Fig. 5 5 a, a) were in connection 

 with the parichnos, as was first shown by Potonie in a 

 Lepidophloios. Professor Weiss has recently investigated 

 the structure, and finds that in Lepidophloios the 

 parichnos-strands run very close to the surface and com- 

 municate with a delicate sub-epidermal tissue containing 

 well-developed intercellular spaces. In a Lepidodendron, 



