only two lines of sori, contiguous to and parallel with the costa. 
From P. diversifolium, which has similarly arranged sori, it is 
as readily recognized by its pinnatifid, not pinnated, fertile 
fronds. 
Bory de St. Vincent’s excellent memoir on his genus, or 
rather, as he calls it subgenus, of Polypodium, “ Drynaria,” in 
the first series of the ‘ Annales des Sciences Naturelles,’ has been 
two much overlooked by Pteridologists, especially of this country, 
perhaps from the work being little known and difficult of access. 
Pirate 35. Fig. 1. Tuft of fertile fronds of Polypodium (Drynaria) Willde- 
nowii, on a very reduced scale. 2. Portion of a caudex, with stipes and sterile 
frond,—natural size. 8. Segment of a frond, with sori,—zatural size. 4. Sori 
and venation. 5. Scale from the caudix,—maynified. 
