74 



TUE GEOLOGICAL HISTORY OF PLANTS. 



; 



with ArchcBopteris is that which I have named Platyphyl- 

 lum, and which grew on a creeping stem or parasitically 

 on stems of other i)lants, and had marginal fructification.* 



Fio. 24. — Archcpopteris Jacksoni, Dawson (Maine). An Upper Erian 

 fern, a, 6, Pinnules sliowing venation. 



* " Reports on Fossil Plants of the Devonian and Upper Silurian of 

 Canada," 1871, &c. 



L 



