118 POLYPODIUM DECUSSATUM. 



Fronds large, beneath subpubescent and bipinnatifid. Stem 

 brown at the base of the frond. Fronds sessile, elongate, and 

 profoundly pinnatifid; segments linear-lanceolate and obtuse. 



Sori in lines, eventually confluent, uniserial, minute, and from 

 ten to twelve pairs on each segment. 



Pinnse opposite or sub-opposite and hirsute, apex acuminate. 



Veins simple and semi-transparent. 



The substance of the frond is thin, and densely but minutely 

 pubescent. 



A singularly delicate-looking species, the sori being very 

 minute. 



It has not yet spread into our English collections, excepting 

 the magnificent one of the Royal Gardens, Kew. 



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

 Royal Gardens, Kew. 



It is not in any Nurseryman's list. 



The illustration is from Mr. Smith's frond. 



