824 Obdbb 160.— FILICES. 



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

 iargest (1' long) in the middle, gradually reduced above and below to the baae, all 

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



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

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

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

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

 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 pinnatifld or pinnate 

 Ifls., lanoe-ovato in outline, glcmdular and fragrant ; Ifts. narrow-pointed, with a 

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

 indusia large, orbicular, peltate, covering segments. — Rooks, Penokee Iron Range, 

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



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

 oblong, obtuse, incisely pinnatifld; 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. Goldi^num Hook. Goldie's Fern. Frond ample, oval or ovate, in ouV 

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

 broad-linear, alternate, deeply pinnatifld, crenate-appressed-serrate, acutish, with 

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

 Fern in rooky woods, K". and W. States and Can. Lfts. close together, about 30 

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



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

 base ; frond narrowly lanceolate ; leaflets deeply pinnatifld, 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) toN. T. 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. margin^le Swtz. Maeginal Shield-Fbhn. Segments of the leaflets 

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

 natifld ; sori marginal ; stipe chaffy. — A large, handsome Fern, in rooky 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. Thelyptera Swtz. Lady Fern. Frond Bmoothish, lance-ovate; ^ts. 

 slender, distant, deeply pinnatifld, 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. dehcate 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. Segm. 25 pairs. JL 



11 A. Novaboraoense Willd. New-Toek Fern. Frond smoothish, ellipiic- 

 lanceolate ; lfts. slender, near or distant, deeply pinnatifld, gradually shorter both 

 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 tha same number of divisions. 



12 A. molle Willd. Frond soft and thin, pubescent with rusty hairs all over, 

 lanceolate, pinnate ; lfts. Unear, pointed, pinnatifld, 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, the 

 stipes a third of this length. Lfts. about 55 pairs, segm. 18. 



