• * » * Fronds more than once piniiaie or pinnatifid.
Small ferns with sub-coriaceous fronds and forking veinlets.
= Ultimate segments very few , long and narrow.
1 1 . A . septentriona le , Hoffm. Fronds 3 to 6 inches high, the stalk alieniately forked;
branches widening into a few (2 to 5) very narrowly cuneate and acuminate entire or sparingly
toothed segments; veins closely parallel; sori elongated, i to 3 to a segment. — Vol. I-, t. xv,,
p. I I I .— Colorado and New Me.xico.
12. A . R u ta -m u ra r ia , L. Fronds i to inches long, deltoid-ovate, laxly 2-3-pinnate
at the base, the divisions alternate ; ultimate segments few, stalked, 2 to 5 lines long, from narrowly
cuneate to roundish-obovate, crenate or toothed or incised at the apex; veins forking ;
sori 2 to 4 on a segment. — Vol. I., t. xv., p. 107. — Vermont to Tennessee.
13 . A . montanum, Willd. Fronds 2 to 4 inches long, sub-coriaceous, ovate or lanceolate
from a broad base, pinnate ; pinnæ ovate or ovate-oblong, the lower ones largest and pinnately
cleft into a few oblong-rhomboid or ovate cut-toothed lobes, the upper ones gradually
14. A . B rad le y i, Eaton. Fronds 4 to 7 inches long, membranaceous, oblong-lanceolate
larger than the middle
= = Ultimate segments wider and shorter.
to linear-oblong, pinnate ; pinnæ rather numerous, the lower ones
ones, all short-stalked, oblong-ovate, obtuse, toothed, or f- ’
toothed lobes. — Vol. II., t. li., p. 39. — Kentucky and T<
large fronds pinnatifid into oblong
simpler. — Vol. II,, t. li., p. 4 1. — New York to Alabama.
'ennessee to Arkansas.
■i- -t- T a ll ferns with herbaceous pinnate fronds, and'long pinnately-lobedpinnce.
15. A . th e lyp te ro id e s. Michx. Fronds i | to 3 feet long, lanceolate, membranaceous,
slightly hairv, pinnate ; pinnæ spreading, linear-lanceolate, acuminate, deeply pinnatifid ; lobes
crowded, oblong, obtuse, obscurely serrulate ; indusia mos'ly single, silvery-white wlien young. —
Vol. II,, t. 1., p. 33. — New Brunswick to Wisconsin and Alabama.
Fronds very delicate, 2-ypinnate, veins single in the ultimate segments or lobes.
1(5. A . m y r io phy llum , Presl. Fronds spreading, 3 to 8 inches long, delicately membranaceous,
lanceolate, narrowed towards the base, 1-3-pinnate; pinnules 2 to 4 lines long,
simple and obovate or else cut into a few obovate segments. — Vol. II., t. li., p. 37. — Florida.
17 . A . c icuta rium, Swartz. Fronds erect, 6 to 15 inches long, membranaceous, ovate-
lanceolate, 2-3-pinnate ; lower pinnæ deflexed ; pinnules rhomboid-ovate, more or less deeply
cleft into several linear-oblong lobes, the larger of these again lobed.— Vol. IL , t. Ivi,, p. 7 7.—
Florida.
§ 2. .Atkyrium. I n d u s ia variously curved, often crossing the fertile veinlet and continued
a short distance down on the other side o f ii.
18. A . F ilix -foe m in a , Bemh. Fronds i to 3 feet long, softly membranaceous, oblong-
lanceolate, 2-3-pinnate ; pinnules adnate to the secondary rachis, ovate to elongated-lanceolate,
variously "toothed or incised; indusia lacerate-ciliate.— Vol. IL , t. Ixxvi., p. 225. — Common
almost everywhere.
1 5 . SCOLOPENDRIUM. S m ith .
I. s. vu lg a re , Smith. Fronds simple, 6 to 18 inches long, i to 2 inches wide, oblong-
ligulate from a deeply cordate base. — Vol. L, t. xxxii., p. 247. — Canada, Central New York,
and Tennessee.
16 . CAMPTOSORUS, L in k .
I. e . rh izoph yllu s, Link. Fronds usually 6 to 12 inches long, sub-coriaceous, evergreen,
gradually nariowed from a cordate and more or less auricled base to a long and slender acumination,
which often roots at the end and thus forms a new plant. — Vol. I. t. viii. p. 3 e —
Canada to Alabama and Kansas. ’ '
1 7 . PH EGOR PERIS , F é e .
• F m 4 s Manguier, hairy or pubmdtut, tht rachi, inkmipiedly winged by the aduaie
basal segments o f the pmnce; rootstock cord-like.
■Á' P°^YPodioides, Fée. Frond 3 to 8 inches long, longer than broad, twice pin-
naufad; secondary segments oblong, obtuse, entire or crenulate; sori near the marírin — Vol
IL , t. Ixxv., p. 21 7. — Greenland and Alaska to tlie Middle States.
. i^®^aSorioptera, Fée. Frond 7 to 12 inches long, broader than long, twice
pinnatihcl; secondary segments entire or crenately toothed, or the larger ones elongated and pinnately
lobed; some of the sori remote from the margin.— Vol. IL , t. Ixv. p 147 — Canada to
Florida and Louisiana.
• • Fronds triangular, ternate, the primary divisions stalked; rachis not winsed ■ root-
stock v e t j slender. ^ ’
. ?■ D ryo pte r is , Fée. Fronds smooth and thin, 4 to 10 inches wide and long; lateral
divisions divergent ; all triangular and pinnate, tlie pinnæ pinnatifid into oblong, obtuse, entire
or even pinnately lobed segments; lowest inferior pinna of the lateral divisions equal to the
second pmna of the middle division. — Vol. I., t. xxi., p. , 5 , . -A r c t ic America to Oregon,
Ohio, and the Eastern States.
4. P . c aloarea, Fée. Fronds minutely glandular and somewhat rigid, 4 to 8 inches
wide anc long ; lateral divisions ascending ; all triangular and pinnate, the pinnæ pimiatifid into
oblong obtuse or even pinnately-lobed segments; lowest inferior pinna of the lateral divisions
equal to the third pmna of the middle division.— Vol. II., p. 2 7 7 .— Minnesota.
« » « Jlootstock short and thick;■ fronds oblong-lanceolate, bi-pinnate or nearly so.
. ,5- Y : a lp e s tr is , Mett. Fronds i to 2 feet long; oblong-lanceolate, pinnate with delicately
bi-pmnatilid deltoid-lanceolate pinnæ; pinnules oblong or oblong-lanceolate, doubly
incised and toothed.— Vol, I., t. xxiii., p. 1 7 1 . — British Columbia to California.
§ I . D ryopitdris
narrow sinus.
1 8 . ASPIDIUM, S w a r t z .
r N ephrodium. hidushmi roundish-reniform or orbicular with
Fronds metnbranaceous, decaying in autumn, rather tall, pinnate with closely pinnatifid
p in na:; veins simple or once forked, normally free.
-K- Root-stock cord-like, elongated, bearing scatteredfronds.
- n ' Swartz. Fronds i to 2 feet long, lanceolate, narrowed from the
middle to the base, minutely ciliate and hairy ; pinnæ sessile, lanceolate, lobes oblong, obtuse,
entire ; veim almost always simple; sori near the margin; indusium delicate, hairy or glandular.
— Vol. 1. t. vii., p. 49. — New Brunswick to Wisconsin and North Carolina.
2. A . T h e lyp te r is , Swartz. Fronds i to 3 feet long, ovate-lanceolate, rarely narrowed