POLYPODIACEiE. 45 



Swartz's description of Polypodhim polycarpon is perfectly applicable 

 to our plant ; but the wide geographical range we here give the 

 species might lead to the supposition, that the plant from islands in 

 the Pacific may be something different from that of the Sooloo and 

 Philippine Islands. A close examination and comparison of the 

 whole, however, has convinced us that they are one and the same 

 species. Still, it must be confessed, that we experience no small 

 difficulty in identifying those species of Drynaria which have entire 

 fronds and scattered sori. This is frequently owing to the short 

 specific definitions given by authors, together with the complex nature 

 of the venation, as well as to a difference in the consistency and form 

 of the fronds of the same species, from different localities, and even 

 from the same root. 



7. Drynaria longifolia, Sp. Nov. 



B. rhizomate repente ; stipitibus brevibus sulcatis; frondibus lineari- 

 lanceolatis utrinque attenuatis subcoriaceis glabris rnargine reflexis 

 subcrenatis ; costa subtus prominente ; soris parvis rotundis numerosis 

 sed sparsis. 



Hab. Luzon, Philippine Islands ; in forests on the mountains, near 

 Banos. 



The rootstock of this, although creeping, is short and paleaceous. 

 Stipes margined, from one to 3 inches high, of a dark brown colour, 

 and sidcate in front. Fronds from lb to 2 feet long, and from 10 lines 

 to li inches broad, linear-lanceolate, and very much attenuated at both 

 ends, the upper surface smooth; the costa and veins very thick and 

 prominent underneath. Sori small, round, scattered, but approximate, 

 and borne from the base to the tip of the frond. 



This differs from the preceding species, in the narrower and attenu- 

 ated fronds, the prominent veins beneath, and in the sori extending 

 from the base to the point. 



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