MESOZOIC PLANTS FKOM KOREA. 37 



reception of sterile fronds of ferns whose real relation to the 

 living forms is unknown. 



CLADOPHLEBIS cfr. DUNKERI (Schimper). 

 PI. IV., fig. 9. 



Among numerous examples of fronds of the Cladophleh'is 

 type, there is one which closely resembles the Wealden species 

 called G. Dunkeri. Possibly it may turn out to be an extremely 

 modified form of the preceding species ; but at present it is better 

 treated as a differrent fossil. 



The specimen shows a bipinnate fragment of a frond, with a 

 stout principal axis from which the pinnae branch off at a wide 

 angle. The pinnae are opposite and close ; the pinnules are 

 small, oblong, often slightly falcate, very close, attached to the 

 rachis with a broad base. 



It is almost impossible to draw a distinction between this 

 fern and C. Dunheri from the Potomac flora (Foutaine, PL XXVI. , 

 fig. 3.). 



CLADOPHLEBIS sp. indet. 

 PI. IV., fig. 8. 



There are several fragments of isolated pinnae of a Cladophlebls 

 which though too imperfect for specific determination, may be 

 briefly described as follows : — 



Pinnae lanceolate, rapidly tapering to an acuminate apex ; 

 pinnules elongated, gradually becoming oval toward the anterior 

 part of the pinna ; slightly pointed at apex and somewhat decurrent 

 at base which is auriculate on the posterior side ; margin slightly 



