LEPIDODENDRON 129 



characters, presented by this armature of leaf-cushions, 

 (Fig. .54) that the distinction of species has been 



Fig. 53. — Lepidodendron Ophiurus. A. Fragment of stem-surface, showing leaf-bases 

 and leaves. B. Leafy branch, bearing a cone at its extremity. Nat. size. After 

 Zeiller. 



founded. It will be well to describe in some detail 

 the essential features of the persistent leaf-base. 



The leaf-cushions are either packed together quite 



9 



