24 A ET. S. H. YABE. 



Sphenoplerls Mantelli given in varions publications. As in the 

 Japanese and the Korean examples, the foreign specimens seem 

 equally variable so that Seward once distinguished a form with 

 broader pinnules from those with narrower. 



Seward also referred some of the ferns described as Splieno- 

 pteris Goepperti by Schenk to Onychiopsls elongata, which was 

 subsequently verified by Krasser's reexamination of the original 

 specimen of Scpienk. Besides, Krasser added that there was a 

 great probability that the specimen referred to the Japanese species 

 was a narrow leaved form of 0. cajosulifera (Velonowsky). 

 Seward is also of the opinion that the distinguishing characters 

 given of 0. MantelU and 0. elongata are not of sufficient impor- 

 tance to render them separate species. 



In the collection from Korea, there are many pinnae with 

 fructification ; the fertile pinnules agree with the Japanese speci- 

 mens both in their dimensions and in their mode of arrangement 

 on the axis. They are arranged on the axis sometimes quite 

 distant from one another as in the figures of the present work, 

 sometimes very close as in the Geyler's drawings. Seward 

 described the fertile pinnules of 0. Mantelli as sessile or short- 

 stalked, and Velonowsky's illustration of 0. capsulifera also 

 clearly shows the same character. A specimen of 0. elongata 

 which Geyler figured, belongs to the upper portion of pinnae 

 with fertile pinnules which are crowded together and furnished 

 with short stalks. Specimens from Korea differ from those above 

 mentioned in having, " the sori placed two at the end of each 

 pinnule, which is considerably narrowed looking like a w^inged 

 stalk ", as Prof. Yokoyama aptly expressed it in his description 

 of the Japanese specimens. 



A comparison of the fertile pinnules of 0. Mantelli with 



