On the Cretaceous Flora of Russian Sakhalin. 



27 



To Mr. H. Tanakadate, who placed his fossil collections from 

 Japanese Sakhalin at my disposal, and to the assistants and several 

 students of all these Institutions I have much pleasure in expressing 

 my best thanks for their kind help. 



VI. Systematic Paleobotany. 



FiLICALES. 



1. Gleichenia rigida Heer. 



1868. Heer, Die foss. Flora der Polarläiider, p. 80, pi. XLIV, f. 1. 

 1874. Heer, Die Ivreideflora der arctischen Zone, p. 43, pi. I, f. 1, 1 b, 5, 



5 a, 5 b. 

 1882. Heer, Die foss. Flora Grönlands, p. 6, pi. II, f. 6, 7. 



Locality : Erikson's coal mine. 



This species is represented by a 

 single specimen of a part of the frond, 

 found in the light-grey sandstone, toge- 

 ther with some other ferns of the genus. 

 The frond in this specimen forks twice 

 and is furnished with narrow linear seg- 

 ments. On both sides of the midrib the 

 two rows of sori are seen. The fern 

 has so far been recorded only in the 

 Kome Beds of Greenland. 



Fig. 1. 

 Gleichenia rigida Hr. 

 (Sketch made in situ) 



2. Gleichenia Zix>pei (Corda) Heer. 



1846. Pecopteris Zippei, Corda in Reu&s, Versteinernngen, p. 95, pi. XLIX 

 f. 1. 



1867. P. Zijipei, Unger, Kreidepflanzen aus Oesterreich, p. 8 (sep. cop.), 

 pi. II, f. 1. 



1868. Gleichenia Zippei, Heer, Fossile Flora der Polarländer, F. F. A., 

 vol. I, p. 79, pi. XLIII, f. 4. 



