12 ART. S. — H. YABE. 



Frond pinnate ; pinnae closely set in two alternating rows, 

 attached to the upper surface of the rachis by the middle of the 

 base at an angle of about 70°. Pinnae linear, very slightly fal- 

 cate, gradually tapering to the bluntly pointed apex ; ranging 

 between 5.0 x 0.2 cm. and 1.2 x 0.3 cm. in size. End pinna 

 smaller than others. Venation very distinct, showing numerous 

 aréoles. Aréoles narrow, elongate and subquadrate, parallel to 

 the margin in the middle of the pinnae becoming shorter and 

 diverging gradually near the margin. 



This most characteristic species is quite common. 



The pinnate fronds obtained in Korea are a little broader 

 than the Indian examples figured by Oldham and Feistmantel, 

 but the pinnae of the former are generally narrower than those 

 of the latter. In other respects, there are no distinctions between 

 them. 



As in I), falcatus from India, our examples also vary greatly 

 in the shape of the pinnae and the size of the aréoles. Thus, 

 the basal portion of the frond shown in fig. 2, is shorter and 

 broader than in others. But there is no example in the writer's 

 collection in which the [)innae show aréoles so coarse as in some 

 of the Indian and Japanese specimens. 1). grosmiervis of Prof. 

 YoKOYAMA,^^ distinguished by having a less number of coarser 

 aréoles, was reduced by Seward"^ to the rank of a variety of the 

 latter. Probably the Korean examples might also better be 

 treated as a particular variety. 



Two fragments of detached jnnnae drawn in the same plate 

 (figs. G, 7) show a somewhat different outline from the others, 

 being considerably broader and more abruptly attenuated to the 



1) YoivOYAMA : ]. <.:. r. 55, pi. VII., iig. 10. 



2) ÖKWAKU : 1. c. r. o. 



