xxi] 



SCHIZAEACEAE 



349 



m the Leckenby collection, Cambridge, in the British Museum, 

 the museums of Manchester, Scarborough, and other places. 



It is possible that specimens referred to K. exilis by 

 Yokoyama^ from Wealden strata in Japan may afford evidence 

 of the persistence of the species beyond the Jurassic era, but in 



Fio. 260. Ryffordia Goepperti. (A, C, sterile ; B, fertile ; slightly reduced. 

 Specimens from the Wealden of Sussex; British Museum ; V. 2333, 

 V. 2160, V. 2166.) 



view of the close resemblance of the sterile fronds described 

 from Wealden strata as Cladophlehis Broumii^ and G. Dunkeri'^ 

 to those of Klukia exilis, identity can be established only by an 

 examination of fertile specimens. A Jurassic fern recently 

 described by Yabe^ from Korea as Cladoplilebis koraiensis may 

 be identical with K. exilis and there is little doubt as to the 

 existence of the species in Jurassic Caucasian strata*. 



> Yokoyama (89). = Seward (94=) A. ^ yabe (0.5) PI. iii. 



•* Seward (O?-*) Pis. i. iii. 



