MESOZOIC PLANTS FROM KOREA. 21 



Of these four, 0. elongaia seems to have been abuiidaiit in the 

 fossil floras of the Japanese Mesozoic. In the Tetori and Kyoseki 

 series, a great many specimens are found from many locaHties, and 

 the occurrence of the same in the somewhat older strata of Nagato 

 has also been very recently pointed out by Prof. Yokoyama. 



Another Japanese species — 0. elerjans Yok. — is known only 

 by one specimen from the Kyoseki series of Tosa. 



Outside of Japan, the genus also possesses a very wide 

 geographical distribution. Particularly worldwide is the distribu- 

 tion of 0. 3Iantelli which is a common fossil in the Wealden 

 rocks of England, and also appears in the deposits of the cor- 

 responding age in Germany, Portugal, Austria and Belgium. 

 Besides, the species is reported from the upper Jurassic of Por- 

 tugal, though the identification of Saporta is doubted by Seward -^ 

 otherwise it is an exclusively Wealden species. In North America, 

 this species has been described from the Potomac formation of 

 Virginia,'"^ and in South Africa from the Uitenhage Series^^ of 

 Cape Town. According to the recent publication of Seward,^' 

 Trichomanites laxum and T. spinifolium from Australia are mere 

 synonyms of this species. 



From the low^er Cretaceous of Bohemia, another species is 

 described under the name of Thyrsoj^teris caps.ulifera."'' Besides, 

 some of the specimens from England*^' and Bohemia'^^ are referred 



1) Seward: Wealden Flora II., p. 229. 



2) Some of the numerous species of the genus Thyrsopterls described by Fontaine from 

 the Potomac of Virghiia, are believed by Sewakd to be 0. Maatelli. 



8) Sewakd: Fossil Floras of Cape Colony, p. 5. 



4) 1. c. 



5) Velenoavsky : Die Farne der Böhmischen Kreideformation, p. 10, pi. I., tigs. 6-12. 

 Krasser : Beiträge z. Kenntniss der fossilen Kreideflora von Kunstadt, p. 121. Ant. Fkic 

 u. E. Bayer: Perucer Schichten, 1900, p. 44, fig. 12. 



6) Seward : Wealden Flora, I., p. 55. 



7) Krasser : Beiträge, p. 121, pi. VII., fig. 1. 



