concealed in it, but afterwards they appear through those aper- 
tures in this mass, which have given rise to the specific name 
applied to this individual by the late Dr Roxburgh. Spe- 
cimens of Dr Roxburgh's plant, gathered in the Delta of the 
Ganges, I possess through the liberality of Dr Walltch ; 
and I find them to accord with the individual here figured, 
except that the back of the fertile frond, below the fructified 
part, is more scaly. Dr Wallich seems to consider the 
P. pertusum of Roxburgh as the same with P. adnascens 
of SvTARTZ, Synopsis Filic. p. 2. f. 2. That plant, however, 
has much shorter and almost ovate sterile fronds, and fertile 
fronds more linear and much narrower in their lower half. 
Polypodium pertusum tunis almost black in drying. 
Fig. 1. Portion of the frond, shewing the fructification. Fig. 2. One of the 
scales which surround the fructification. Fig. 3. Cluster of capsules, 
with some of its surrounding scales. Fig. 4. Capsules, separated from 
the cluster. Fig. 5. Scale from the sterile frond. — All more or less mag- 
nified. 
