CRYPTOGAMIA, FILICES. 
20S 
391. ASPIDIUM. Swartz, Synop. filic. 3. 
Nephrodium, Mich. 
Sori roundish^ scattered. Indusium umbili- 
cate or opening on one side. — JSTutt. 
aerostichoi- 1. A. froiids piiinate ; pinnae lanceolate, falcate, 
acute, ciliate-serrated ; upper base mucronate- 
auriculated, lower fructificant and smaller; 
stipe and rachis paleaceous ; sorae solitary, at 
lengtii, confluent. — Willd, 
A. auriculatiim, Schk. 
Nephrodium acrostichoides, Mich. 
Terminal Shield Fern. 
On the rocks in the vicinity of our waters, common ; also in 
woods. Perennial. June. 
maiginaie. A. frouds bi-piiiuate ; pinnulae oblong, obtuse, 
decurrent, crenate, the folds deepest at the base ; 
sorae marginal ; stipe paleaceous. — JVilld. 
Polypodium marginale, Sp. PL 15£2. 
Nephrodium marginale, Mich. 
Icon. Schk. fiiic. t. 45. b. 
Marginal Shield-fern. 
In shady woods, particularly on rocks. Perennial. July. 
intermedium. 3 . A. fronds bi-pinnatc ; pinnulae linear, pinnati- 
fid-incised ; segments sub-mucronate, serrated 
at the apex; stipe paleaceous. — Willd. 
Large Shieldfern. 
A large and well-marked species. In the woods of Jersey, 
among other ferns — more rare west of the Delaware. Peren- 
nial. July. 
novebora- 4. A. frouds pinnate ; pinnae linear-lanceolate, 
pimiatilid ; segments oblong, somewhat obtuse, 
nearly entire, ciliated; sor^ marginal ; stipe 
even.^-IVilld. and Fursh. 
