994 FILICES. (FERNS.) 
2. C. bulbifera, Bernh. Fronds lanceolate, very long and attenuated at 
the apex, often bearing bulblets beneath, bipinnate ; pinnze triangular-lanceolate ; 
the lowest pair largest, distant; pinnules oblong, crenately incised or toothed, 
obtuse; indusium roundish, truncate. (Aspidium bulbiferum, Swartz.) — Rocks 
on the mountains of North Carolina, and northward. — Fronds 19-39 long. 
The bulblets fall to the ground, and form new plants, which are about two years 
in coming to maturity. 
13. ASPIDIUM, Swartz. SHIELD-FERN. 
Fruit-dots round, borne on the veins mostly below their apices. Indusium 
round-reniform and fixed at the sinus, or orbicular and fixed by the depressed 
centre. Veins with acute or attenuated apices. Our species have free veins" 
and 1 -3-pinnate fronds. 
$1. LASTREA, Bory. Indusium round-kidney-shaped, fixed at the sinus. 
* Fronds thin and delicate, decaying in autumn; ultimate segments entire or nearly 
so; veins simple or once forked. 
1, A. Thelypteris, Swartz. Fronds smooth, ovate-lanceolate, pinnate ; 
pinnz lanceolate, often recurved, deeply pinnatifid ; the lowest 1 — 2 pairs rather 
smaller ; segments oblong, obtuse, nearly entire, the fertile ones with a strongly 
revolute margin; veins mostly forked ; indusium minute, smooth. — Swamps 
and bogs, Florida, and northward. — Fronds 10'—18/ long, with an elongated 
stipe. This species and the next one have slender, nearly naked rootstocks, 
which creep several inches in advance of the fronds. 
2. A. Noveboracense, Willd. Fronds lanceolate, tapering both ways 
from the middle, pinnate ; pinnx Janceolate, hairy beneath along the midrib ; 
the lowest 4 - 6 pairs gradually smaller, distant and deflexed ; segments oblong, 
obtuse, nearly entire; veins simple ; indusium minute, smooth. — Low grounds, 
North Carolina, and northward. — Fronds 19 — 2° long, on rather short stipes. 
3. A. patens, Swartz. Fronds ovate or oblong-ovate, pubescent, espe- 
cially on the veins beneath, pinnate; pinnæ lance-linear from a broad base, 
deeply pinnatifid; the lowest pair a little smaller and reflexed ; segments 
oblong, often faleate, entire, or the upper basal one enlarged and pinnatifid ; 
veins simple, free, or the basal ones meeting at the sinus between the segments ; 
indusium small, pubescent. (A. molle, Kunze in Sill. Jour.) — Low shady woods, 
Florida to South Carolina, and westward. — Fronds 19 — 3° high. 
* * Fronds thicker; ultimate segments more or less serrate or toothed ; the lowest 
e veins more than once forked. : 
.. & A. spinulosum, Swartz Fronds ovate-oblong, thin, smooth; bipin- 
nate or below tripinnate ; pinnx oblong-lanceolate; the lower ones broader, 
.  trangularovate; ultimate segments oblong, or linear-oblong, closely set on ^ 
_ marrowly winged partial rachis, variously incised or serrate with spinulose teeth; 
