rOSSIL FLORA. 23 



PLATE III. 



Petrified Stems and Leaves. 



Fig. 1. A portion of the trunk of the fossil vegetable called Stigmaria ficoides (of M. Alex. 

 Brongniart) ; it is the root of a tree common in the coal deposits ; see Supplementary 

 Notes, Art. Stigmaria, p. 198, for a description of the nature and mode of occurrence 

 of these fossils. 



Fig. 2. Impressions of dicotyledonous leaves in travertine; a modern calcareous deposit; from 

 Campania. 



Fig. 3. Part of the stem of a reed-like plant {Galamites duhius, Brongniart) ; from the coal 

 deposits of Yorkshire. See description of Galamites. 



Fig. 4. Appears to be a fragment of the stem of a species of Lepidodendron. 



Fig. 5. Fragment of the leaf of a Cycadeous plant, from the oolite of Stonesfield. {Zamia 

 pectinata.) 



Fig. 6. Portion of an ironstone nodule, split asunder, showing part of the terminal branch of 

 a Lepidodendron, from Coalbrook Dale. See description of Lepidodend/ron. 



Fig. 7. " a pebble that appears to have been partly enveloped in a leaf while in a soft state, 

 which has produced the markings on its surface." — Mr. Parkinson. 



Fig. 8. " Ligniform pitchstone ;" fossil wood having a resinous transparency; supposed by 

 Mr. Parkinson to have originated from an intermixture of silex and bitumen ; the 

 internal part is opalized. 



Fig. 9. Fragment of calcareous coniferous wood from the Lias of Charmouth, Dorsetshire : the 

 vegetable structure is well preserved. 



' Medals of Creation, vol. i. p. 193. 



