On tlie Cretaceous Flora of Eussian Sakhalin. •^J 



3. Gleichenia sp. (Subgenus Eugleichenia). 



Locality : Erikson's coal mine. 



This specimen, showing a single sorus on each segment, is to 

 be properly put into the subgenus Eugleichenia. Gleichenia ner- 

 vosa'^ is most closely allied, in form to our specimen. Though 

 previously regarded by Heee as Eugleichenia, it was afterw^ards 

 separated by himself'^ from this subgenus, for which reason the 

 comparison with G. nervosa of our real Eugleichenia may not be 

 admitted. From the very similar species G. Nordenskiöldii Hk.'^ 

 and G. rotula He.,'' our species differs by the segments attached 

 on their entire base, which is not contracted above it as in these 

 species, w^hich are, moreover, furnished with a single sorus only 

 in exceptional cases. The true species of Eugleichenia, namely, G. 

 acutipennisp G. delicatula^ and G. micromera'' are quite different 

 from our species. G. optaUlis^^ seems to be more allied with it, 

 but is represented only by specimens too fragmentary to speak of 

 real identity. Probably it may later appear advisable to separate 

 otir fossil as a new particular species. 



4. Dicksonia 3Imniyai n. sp. 



Locality : Sea-shore at Mgach. 



A single plate of shale shows a part of the pinna or the 

 frond with narrow lanceolate pinnules bearing triangular segments 

 stretched forward. The sori are disposed on the proximal edge of 



Heeb (1874), p. 53, pi. XL, f. 3-6. 



Heee (1882), p. 8. 



Heek (187i), p. 50, pi. IX, f. 6-12; id. (1882) p. 8, pi. I, f. 1. 



Heee (1874), p. 48, pi. VHI, f . 4, 5 ; IX, f. 1-4. ; id. (1882) p. 8, pi. H, f. 8. 



Heeb (1874), p. 53, pi. X, f. 12; id. (1882), p. 9. 



Heee (1874), p. 54, pi. IX, f. 11 ; X, f. 16, 17 ; id. (1882) p. 9. 



Heee (1874), p. 55, pi. X, f. 14, 15; id. (1882) p. 9. 



Heee (1880), p. 5, pi. I, f. 13 ; id. (1882) p. 9. 



