120 THE GEOLOGICAL HISTORY OF PLANTS. 



Fig. 43. — Lepidodendron corrugatum, Dawson, a tree characteristic of the 

 Lower Carboniferous, a, Eestoration. b, Leaf, natural size, c, Cone 

 and branch, d, Branch and leaves, e. Various forms of leaf-areoles. 

 f, Sporangium, i, l, m, Bark, with leaf-scars, w, Bark, with leal- 

 scars of old stem, o, Decorticated stem (Knorria). 



