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120 THE GEOLOGICAL HISTORY OF PLANTS. 



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Fio. 43. — Lepidodendron corru(/atum, Dawson, a tree characteristic of the 

 Lower Carboniferous, a, liestoration. b. Leaf, natural size o, Cone 

 and branch, d, Branch and leaves, e. Various forms of Icaf-arcoles. 

 F, Sporai)(ji>im. i, l, m, Bark, with leaf-soars, n, Bark, with Ical- 

 Bcors of ol«i stem, o, Decorticated stem {Knorriu). 



