Ill 



vein is somewhat flexuous, and gives off alternate lateral 

 veins, one of which is directed toward the sinus or margi- 

 nal indentation between two serratures. The sori have the 

 usual roundish form common in this genus, and, being 

 numerous, they become very conspicuous when fall-grown ; 

 but though crowded they do not appear often to become 

 confluent. These sori are covered, in the young state, by 

 a blunt, concave, jagged-edged indusium. 



This rare species occurs wild in the United Kingdom only, 

 as far as is known, among the Breadalbane mountains of 

 Scotland, on one of which, Ben Lawers, it was originally 

 found by Mr. Wilson, in company with Sir W. J. Hooker 

 and Professor Graham ; this was in August 1836. Subse- 

 quently, in 1841, Messrs. Gourlie and Adamson again met 

 with it, on the "mountains between Glen Dochart and 

 Glen Lochey." Mr. Gourlie again, we believe, as well as 

 Dr. Arnott and Mr. Borrer, met with it in 1850. In the 

 European Alps this Fern is met with, most abundantly 

 northwards ; and it also occurs on the Eocky Mountains of 

 the New World, occurring for the most part in its wild 

 haunts, on rough stony ground in sub-alpine regions, but 

 sometimes also in woods. 



The synonyms of this species are Polypodium montanum, 

 Aspidium montanum, and CyatJiea montana. 



