130 



STUDIES IN FOSSIL BOTANY 



closely and separated only by narrow grooves (Fig. 

 54), or more scattered, with wider flat bands of the 



S.C 



Fig. 54. — Lepidodendron Veltheimianum. Portion of surface of stem, showing the 

 leaf-bases (/.^.), with the leaf-scar (s.c.) at the upper end of each. 3 nat - s ' ze - 



stem -surface exposed between them. The whole 

 cushion is rhombic in outline, and somewhat prominent, 



having a flatly pyramidal form. 

 The apex of the pyramid is 

 truncated, forming a flat sur- 

 face, which represents the scar 

 left by the fall of the leaf (see 

 Fig- 5 5) s - c )- Thus the actual 

 scar only occupies a small part 



Fig. 55- - Lepidodendron. Leaf-base. f the whole rhombic area, 

 sc, leaf- scar; 7/.&, print of 



bundle ; p, double parichnos ; a, mOSt of which IS formed by 



superficial prints on either side of , . 1 /- 1 • t*i 



cushion ; /, liguie. Figs. 54 and the persistent leaf-cushion. The 



S5afterStur - whole is not symmetrical, for 



the leaf-scar always lies near the upper end of the 



cushion. On the flat surface of the scar itself, three 



