24 POLYPODIUM QUERCIFOLIUM. 



First brought into England in 1824, and introduced by Dr. 

 Wallich into the Royal Gardens, Kew, in 1840. 



Fertile and barren fronds different. 



Sterile or barren frond sessile, oblong-ovate in form, cordate 

 at the base, sinuose, with the vascular structure permanent and 

 rigid. 



Fertile frond stipitate, pinnatifid, with linear undulated acu- 

 minate segments; margin stout, articulated with the rachis. 



Sori circular, oblique, and somewhat irregular, and spread 

 along the whole of the under surface of the frond. 



In the "Genera and Species of Cultivated Ferns," by Mr. 

 Moore and Mr. Ploulston, it is mentioned that there are several 

 well-defined forms of this species, two of which are in cultivation 

 in England; the first has cordate-ovate sterile fronds six inches 

 in length, and stipitate fertile fronds two feet in length. The 

 second is a noble plant, with cordate-oblong pinnatifid rigid 

 sterile fronds, from three to four feet long, but it has not 

 produced fertile fronds. 



Khizoma thick, scaly, and creeping. 



For plants of this species I am indebted to Mr. Clarke, the 

 Curator of the Royal Botanic Gardens, Glasgow, and to Mr. 

 Stewart, of the Cambridge Botanic Gardens; and for fronds to 

 Mr. Sim, of Foot's Cray, Kent. 



It is in the Catalogues, true to its name, of Mr. Sim, of Foot's 

 Cray, and Messrs. A. Henderson, of Pine-apple Place. 



The illustration is from a barren frond forwarded bv Mr. Sim, 

 of Foot's Cray. 



