MESOZOIC PLANTS FKOM KOREA. 



45 



P. lanceolaius (Lindle. & Hutton) rare. 



Pinus sp. common. 



Pinus sp. common. 



Onychiopsis elongata (Geyler) abundant. 



Coniopteris Heerianus (Yokoyama) common. 



Ö. hymenophylloides (Brongn.) (?) rare. 



Cladophlebis cfr. denticulata (Brongn.) rare. 



C. koraiensis sp. nov. abundant. 



C. cfr. Dunheri (Schimher) rare. 



C. sp. rare. 



Sphenopteris nalclongensis sp. nov. common. 



S. sp. rare. 



Adiantltes Sewardi sp. nov. abundant. 



Sagenopteris hilohata sp. nov. rare. 



Equisetum ushimarense Yok. common. 



In the constitution of tlie flora, Filices form of the most 

 important part, being represented by 6 genera and 11 species. 

 Among these, three species are found in great abundance. Cy- 

 cadophyta, though fairly common, are less frequent than the 

 ferns, being represented by 5 genera and 7 species. Equisetaceae 

 and Coniferae, though not rare, are all not clearly determinable. 

 It is very striking that the fern fronds are generally in a fertile 

 state, just as in the fire-clay of Cracow, described by Raciborsky. 

 Such are Onychiopsis elongata, two species of Conlopieris, and 

 one species of Sphenopteris ; likewise the pinnae of Cladophlebis 

 koraiensis mostly show the fructification. 



Geological relation of the fossil flora : — From the above list 

 it is quite evident that the flora is Jurassic, for neither typically 

 Khaetic nor Cretaceous forms are found in it ; the form which may 

 be assigned with hesitation to the Wealden type is but a single 



