MESOZOIC PLANTS FßOxAl KOREA. ÔO 



cisely similar to Geyler's drawiüg, and hence also like figs. 8 

 and 10 in Prof. Yokoyama's work. The other examples show 

 much resemblance to fig. 9 of the latter and evidently belong to 

 the terminal and middle portions of the same fern. 



The Japanese fern, so well illustrated by Prof. Yokoyama 

 possesses oblong pinnules, in general differing from the Korean 

 by a decidedly obtuse outline, often broader and rising from the 

 racliis at a wider angle. 



A similar fern was described by Prof. Yokoyama from 

 Japan under the name of Asplenmm argululum ; among the figures 

 referred to this species, in pi. III., fig. 1, agrees well with the 

 Chinese examples described by Schenk ; while those represented 

 in fig. 9, pi. XII r. and fig. 22, pi. XIV., show a great resem- 

 blance to the Korean. Prof. Yokoyama had already made the 

 remark that the latter two examples have a great resemblance 

 to some forms of P. Fhillipsi Brgt. {P. exilis). It is by no 

 means improbable that some of these figures represent plants 

 which are really identical with the Korean species. In the 

 Ryoseki flora of Japan, there is Cladophlehis Browniana^'' a 

 Wealden species of world wide distribution, associated with C. 

 Geyleriana Nath.,"^ a hitherto solely Japanese form. 



When Nathorst first described P. Geyleriana, he was unable 

 to trace out the lateral veins of the pinnules, and therefore, 

 though he possessed the fertile pinnae provided with round sori 

 on each side of the median vein, he took it to be simply a species 

 of Pecopterh. Its relation to Lonchopteris which he then suspected, 

 was subsequently made impossible by Prof. Yokoyama's exami- 



1) Yokoyama: Mesoz. Plants from Kozuke, Kii, Awa and Tcsa, p. 218, pi. XXIV., 

 figs. 2 & 3; XXVir., 1-4, 5c, d. 



2) Yokoyama: 1. c. p. 219, pi. XXI., figs. 1, 2; XXIII., la, 1; XXVIII., 5. 



