132 POLYPODIUM LONGIFOLIUM. 



Sori prominent, uniserial, submarginal, oblong, or oval, and 

 formed on the upper two-thirds of the frond, extending nearly 

 to the apex; about forty pairs; colour a brownish orange, and 

 raising umbones on the upper side of the frond. 



Length from twenty to twenty-two inches; colour a bright 

 shining green. 



Rhizoma creeping. 



This species has more the looks of a Scolopendrium than of 

 a Polypodium. 



Perhaps best known as the Phymatodes longifolia. 



A charming Fern, remarkably distinct from all others. The 

 submarginal line of sori, and the raised oval-shaped umbones 

 shewing the place of the sori when viewing the frond from 

 the upper surface, render it an exceedingly desirable species 

 to all lovers of the curious and beautiful in this tribe of plants. 



For fronds I am indebted to Mr. J. Smith, Curator of the 

 Royal Gardens, Kew; and to Messrs. Booth, of Hamburg. 



This species may be procured of Messrs. Booth, of Hamburg. 



The illustration is from Mr. Smith's frond. 



