AspipiuM. CLXIV. FILICES. 629 
* Frond pinnate. 
1. A. acrosTicHéipes. Willd. (Nephrodium. Michz.)- 
Leaflets of the frond distinct, alternate, subsessile, falcate-lanceolate, auri- 
culate on the upper side at base, ciliate-serrulate, only the upper ones fertile; 
sori at length confluent; stipe chaffy—Common in rocky shades. Frond 15—18/ 
high, of a narrow-lanceolate outline. Stipe with loose, chaffy scales. Leaflets 
numerous, slightly curving upwards, 1—2/ in length, the terminal ones, which 
alone are fruitful, are contracted in size, the under side becoming overspread 
“with the sori. June—Aug. Y 
_ B. imcisum. Gray. (A. Schwenitzii. Beck.) Pinne irregularly and incisel 
dentate ; sori mostly distinct —N. Y., N. J. and Penn. Passes insensibly into a. 
* * Frond pinnate with pinnatifid leaflets, 
2. A. THELYpPrERA. Willd. (A. Noveboracense. ejusd.) Shield-Fern. 
Leaflets of the frond \inear-lanceolate, deeply pinnatifid, distinct, subses- 
sile; segments oblong, obtuse or acute, subentire, ciliate ; sori marginal, small, 
at length confluent; stipe smooth and naked.—Damp woods. Fronds pale 
green, thin and delicate, about a foot long and 3 as wide, acuminate at apex. 
Leaflets acuminate, becoming entire above, sometimes crossing (decussating) at 
base. Rachis pubescent. Stipe slender, channeled on the upper side. Sori 
= 2 poe rows.on each segment, finally nearly covering their under sur- 
ace. July. 
B. Noveboracensc. Rather paler and more delicate in texture; leaflets more 
narrow and remote. 
3. A. crisTatuM. Willd. (Nephrodium, Mz.) Crested Shield-Fern. 
Frond nearly bipinnate, lanceolate-ovate ; leaflets subcordate, oblong-pin- 
natifid, segments oblong, obtuse, ciliate-serrate ; stipe scaly —Moist woods and 
meadows, N. Eng., Mid. States, rather rare. Frond 12—18’ high, pale green, 
remarkable for its broad, ovate-lanceolate outline. Segments of the leaflets some- 
times almost distinct, broad and obtuse, with sharp teeth. Sori large, in double 
rows, tawny when mature, chiefly on the upper half of the frond. July. 
4. A. LancasTRIENSE. Spreng. (A. cristatum. 8. 1st. edit.) Lancaster 
Shield-Fern.—Stipe with a few large, oblong, torn scales, chiefly at base ; 
frond narrowly lanceolate ; leaflets subopposite, remote, short-petiolulate, broad- 
est at base, the lower triangular-ovate; sori large, in a single row each side the 
midvein of each dentate segment; imdusiwm fixed near one side—Woods, 
Meriden, N. H., Rickard! to N. Y. and N.J. A beautiful fern, quite distinct 
from the preceding, 24—30’ high. Frond dark green, 15—18’ by 5—8’. Leaf- 
lets gradually narrowing from base to apex. Segments nearly distinct, more or 
less distinctly serrate-dentate, each with 1—25 dark-brown sori (lower leaflets 
fruitless). July. 
5. A. Gotpianum. Hook. (A. Filix mas. Pursh.) Goldie’s Fern. 
Leaflets of the frond lanceolate, acuminate, deeply pinnatifid; segments 
oblong, subacute, subfalcate, mucronate-serrate; sori in 2 rows, each side of the 
vein of each segment. A tall species, 2—3f high, in rocky woods. Fronds 
numerous, bright green, scaly upon the stipe and rachis, 5—10’ wide. Leaflets 
3—6’ long, not widening at base, with elongated, narrow segments. July: 
* * * Frond bipinnate. 
6. A. MARGINALE. Sw. (Nephrodium. Mz.) Marginal Shield-Fern. 
Segments of the leaflets oblong, obtuse, decurrent, crenate-sinuate, repand 
at base, lower ones almost pinnatifid; sort marginal; stipe chaffy.—A large, 
handsome fern, in rocky woods, common. Frond 12—18’ high, very smooth 
etre a little chaffy), its divisions nearly opposite. Segments of the leaflets 
istinct, near an inch long, } as wide, contracted at base, then decurrent, form- 
ing a narrow margin along the rachis. Fruit in round dots, in regular rows 
along the margins of the segments. Indusium large, orbicular, with a lateral 
sinus. July. 
7. A. Tenve. Sw. (A. fragile. Willd. Cistopteris. Bernh.) Brittle 
Shield-Fern.—Segments of the leaflets oblong, obtuse or acute, incisely ser- 
rate, approaching to pinnatifid, its serratures subentire; rachis winged by the 
