824 OBDEB 160. FILICES. 



(8 to 12') ; Ifts. obliquely triangular-ovate, auricled on the upper side at base, 

 largest (!' long) in the middle, gradually reduced above and below to the base, all 

 beset with close, spiny teeth, and covered with fruit beneath. X. Mich. Br. Am. 



4 A. aculeatum Swtz. Segments of the leaflets ovate, subfalcate, acute, acu- 

 leate-serrate, truncate and auricled on the upper side at base, upper leaflets fer- 

 tile; stipe and racbis chaffy. Mansfield Mt., Vt, and Mts. in Essex Co., N. Y.. 

 (Macrae). Fronds dark green, in tufts 1 2f high. Segments of the leaflets ou 

 very short petioles, somewhat dilated at base on the upper side, deeply serrate, 

 each serrature tipped with a short spinous bristle. Sori in rows, distinct. Aug. 



5 A. fragrans Swtz. Frond coriaceous, pinnate with deeply pinnatifid or pinnate 

 Ifts., lance-ovate in outline, glandular and fragrant; Ifts. narrow-pointed, with a 

 dozen pairs of small, obtuse, bristly serrate segments which are unequal at base ; 

 indusia large, orbicular, peltate, covering segments. Rocks, Penokee Iron Range, 

 L. Sup. (Lapham) and northwest. Frond 6 to 12' high. Stipe and rachis chaffy. 



6 A. spimilosum "Willd. Leaflets oblong-lanceolate, distinct ; segments distinct, 

 oblong, obtuse, incisely pinnatifid ; ultimate segments mucronate-serrate ; stipe 

 chaffy ; indusium umbilicate. "Woods and shady pastures. Fronds 1 2f high, 

 nearly tripinnate, the foliage about twice as long as wide, acuminate at apex, 

 abrupt at base. Leaflets also acuminate, but the segments rather obtuse, all dis- 

 tinct at base, except those near the summit, serratures with short, soft bristles. 

 Stipe with large, tawny scales. Sori large. Jl (A. dilatatum Swtz.) Variable. 



7 A. Goldianum Hook. GDI/DIE'S FERN. Frond ample, oval or ovate, in out- 

 line (10 to 16' long, two-thirds as wide) pinnate, as long as the smooth stipe; Ifts. 

 broad-linear, alternate, deeply pinnatifid, crenate-appfessed-serrate, acutish, with 

 2 rows of distinct fruit-dots near the midvein ; indusium reniform-peltate. A large 

 Fern in rocky woods, N. and "W. States and Can. Lfts. close together^ about 30 

 pairs, with about 20 pairs of segments. Stipe chaffy at base, scarcely so above. 



6 A. cristatum Swtz. Stipe with a few large, oblong, torn scales, chiefly at 

 base; frond narrowly lanceolate; leaflets deeply pinnatifid, remote, short-petiolu- 

 late, broadest at base, the lower triangular-ovate; sori large, in a single row each 

 side the midvein of each dentate segment; indusium fixed near one side. Woods, 

 Can., N. H. (Rickard) to N. Y. and N. J. A beautiful Fern, 20 to 30' high. Frond 

 dark green, 15 18' by 5 8'. Leaflets 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. (A. Lancastriense Spr.) 



9 A. marginale Swtz. MARGINAL SHIELD-FERN. Segments of the leaflets 

 oblong, obtuse, decurrent, crenate-sinuate, repand at base, lower ones almost pin- 

 natifid ; sori marginal ; stipe chaffy. A large, handsome Fern, in rocky woods. 

 common. Frond 12 18' high, very smooth (rachis a little chaffy), its divisions 

 nearly opposite. Segments of the leaflets distinct, near an inch long, J as wide, 

 contracted at base, then decurrent, forming 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. 



10 A. Tnelyptera Swtz. LADY FERN. Frond emoothish, lance-ovate; fa. 

 slender, distant, deeply pinnatifid, gradually shorter from near the base upwards ; 

 segm. acute, margins reflexed in fruit ; sori in 2 lines, as near the midvein as the 

 margin. A delicate Fern, in damp shades, frequent, about If high, half as wide. 

 Lfts. 2 to 3' long, about 20 pairs, lowest pair as long as any. Segin. 25 pairs. Jl. 



11 A. Novaboracense "Willd. NEW- YORK FERN. Frond smoothish, elliptk- 

 lanceolate ; Ifts. slender, near or distant, deeply pinnatifid, gradually shorter bo;h 

 ways to a point from the middle, the lower reflexed ; segm. obtuse, oblong, flat ; 

 sori in 2 rows close to the margin, at length confluent. Fern as thin and delicate 

 as the last, 12 to 18' high, 3 to 4' wide, with about the same number of divisions. 



12 A. patens Swz. Frond soft and thin, pubescent with rusty hairs all over, 

 lanceolate, pinnate ; Ifts. linear, pointed, pinnatifid, lobes short-oblong, very obtuse 

 entire, with simply pinnate veins ; indusia round-reniform, small, scattered without, 

 order near the midvein. Dry woods, Fla. (Chapman). Fern 12 to 18' high, tre 

 stipes a third of this length. Lfts. about 25 pairs, segm. 18. (Amolle Kunze). 



