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. 



Fig. 12. — The fern, Onoclea. A, the living sensitive fern, 0. sensibilis L. (X \), 

 from Maine; the fruiting stalk between two sterile leaves. B, 0. inqtiirenda 

 HoUick ( X I), from the Cretaceous of Long Island, New York ; the fruiting 

 stalk. (5, from HoUick.) 



