40 ART. 8. — H. Y A BE. 



current petiole. Lateral pinnules generally inequilateral, varying 

 from subquadrilateral to fan-shaped, with inner margin parallel 

 and very close to the rachis. Apical pinnules nearly equilateral, 

 being broader than the others. Upper margin irregularly crenu- 

 lated. Veins numerous, fine, uniform and distinct, united below 

 at the base, widely spreading and dichotomously divided upward. 



According to the general usage, this elegant fern is referred 

 to the provisional genus Adicmtltes on account of its undoubted 

 resemblance to some living sjDCcies of Adiantum or Lindsaya. 



Among the recorded species referred to Adimitites or some- 

 times to Adiantum itself, there are three species more or less 

 allied to the present species ; Adiantites Tietzi Schenk^^ from the 

 Khaetic of the Albours-chain, Adiantum Szechenyi Schenk^^ from 

 the middle Jurassic of China and Adiantites yuasensis Yok.^'^ 

 from the Ryoseki series of Yuasa in Japan. The resemblance 

 of the Korean frond to the last species has already been pointed 

 out by Mr. Matsushima. 



In the first of these three species, the pinnules are more 

 densely crowded and deeply imbricated ; the other two species 

 exhibit a somewhat different venation. 



A species which is nearer to the Korean than any of the 

 above three is Adiantites lomjiqmiis Saporta (Nouvelles Contribu- 

 tions a la Flore Mesozoique 1894. p. 40, i^l. X., fig. 1.) from the 

 Neojurassic deposit of Portugal. This species was founded by 

 Saporta on a few fragmental pinnae with subopposite pinnules ; 

 however, so far as one can judge from the characters revealed 



1) FciiENK : Fossile Pllanzeii aus der Alboiirs-kette, gesammelt von E. Tietze. 1887, 

 p. ?,, 1.1. 11., fig. 9. 



2) Schenk: Fossile Pflanzen (Graf. Szecheny's Reise Vol. III.) P. IßS, pi. I., fig. P>. 



3) YoKOYAMA: Mesoz. Plants from Kozuke, Kii, Awa and Tosa. P. 210, pi. XXI., 

 flg. 15. 



