296 BRITISH FERNS 



XVII 



Cristata Roberts (KV/.) 



Mr. Roberts. Llanberis. Carnarvon. 1870. 



1 ft. 9 in. 



Syn. cristata-gracilis {Jones) 



Under glass by Mr. Mapplebeck. Would be one of the most 

 useful of British Ferns were it not for a partial depauperation that 

 sticks to this variety and its progeny as persistently as it does to 

 L. f.-mas Jervisii. 



