PTERIDOPHYTA 



47 



means " stony " ; this suffix is used in many names of fossil 

 plants to suggest their kinship with modern forms. 



(2) Dictyopteris and Camptopteris. — Remarkably handsome 

 forms of Upper Triassic-Cretaceous age, with lyrate fronds 

 often three feet or more broad, and with a characteristic netted 

 venation. 





C,^ I 



Fig. 12. — The fern, Onoclea. A, the living sensitive fern, O. sensibilis L. (X 4), 

 from Maine ; the fruiting stalk between two sterile leaves. B, O. inquirenda 

 Hollick ( X f ), from the Cretaceous of Long Island, New York ; the fruiting 

 stalk. {B, from Hollick.) 



