N. O. Filices. 
DCCCCXLIIL. 
POLYPODIUM LEUCOSORUM, Boj. 
(status senilis) 
See description under Tab, 942. 
Has. Isle of Bourbon, “Polypodium, No 3, from the Museum 
de P'Histoire Naturelle.” 
_ The entire absence of white sori, the very copious fructifica- 
tions, and the usually broader and more obtuse segments of 
the frond misled me as to the identity of the species of this 
Fern; and it is only since the lithograph was executed and 
all the impressions worked off, that I have satisfied myself 
it is the old state of Polypodium leucosorum, every segment 
loaded with brown sori. Some of our specimens, too, prove 
that the sori vary to elliptical as shown at fig. 2. and the 
receptacles of the capsules are probably invariably oblong as 
shown at fig. 1. 
Fig. 1. Segment of a fertile frond, from which the sori are 
removed. Sf. 2. fertile segment seen from beneath, with the 
sori more elliptical than usual —magnified. 
