
296 BRITISH FERNS 
XVII 
CRISTATA ROBERTS (Ш/о//.) 
Mr. Roberts, Llanberis. Carnarvon. 1870. 
it füb, ©. 
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 Jervisti. 


