MESOZOIC PLANTS FROM KOREA. 27 



CONIOPTERIS HEERIANUS (Yokoyama). 

 PI. IL, fig. 8; pi. III., figs. 9, 14. 



1889. Adicmtites Heerimius Y ok.: 1. c. p. 28, pi. XII., figs. 

 1, la, lb, and 2. 



Frond bipinnate, ovate ; principal racliis Kslender, but stout 

 and straight, partly winged ; pinnae oblique (making an angle of 

 about 40°-50° with the principal rachis), rather distant from one 

 another, long, rapidly becoming shorter toward the anterior por- 

 tion of the frond ; pinnules rather distant, alternate, oblongly 

 rhomboidal, gradually tapering below, and lobed ; lobes small, 

 acutely directed forward, acute at apex ; venation very fine 

 and indistinct, median vein sending off alternately into the 

 lobes branches which fork once or twice. Leaf substance coria- 

 ceous ? 



The pinnae of the anterior part of the frond are simple- 

 lobed. The sori which are found on these pinnae are reniforra, 

 fixed to the margin of each lobe, at the end of the vein ; usually 

 there is one sorus on the inner margin of the lobe, but sometimes 

 many along the inner as well as the outer margin. Each anterior 

 portion of the posterior pinnae is also simple-lobed, without being 

 cut so as to form separate pinnules. 



After a careful study, the writer w^as convinced of the identity 

 of tlie examples with a Japanese species, very rarely found in 

 the plant-bed of Shimamura, prov. Kaga. The Korean and the 

 Japanese examples are precisely similar in characters, but it is 

 necessary to note that the type specimens from Japan consist of 

 but four fragmental pinnae, for which Prof. Yokoyama gave the 

 following diagnosis : 



