426 ORDER 159. FILIOES, 



1 A. acrosticlioide* Swtz. Frond narrow-lanceolate, 1318'; stipe chaffy; pn 



taleate-lanceolate, ciliate-scrrulate, 1 2', auricnlatc on the upper side at base, the np 

 per covered with frr.lt, smaller than the sterile. Rocky shades. Common. 

 ft. inctsuin. Segments incised and sharp-toothed, most of them fertile. N. Y., &c. 



2 A. Louchitis Sw. Frond linear-lanceolate, rigidly erect, 8 IS': pn. triangular- 



ovate, auricled on the tipper Bide at base, longer! (!') in the middle, gradually les- 

 sened to apex and base, all densely fertile. Lake Superior, and N. 



8 A MUIUTUM. A splendid Fern from California, growing in clumps, 3 5f, smooth, 

 rigid, evergreen, lance-linear ; segm. oblong-falcate, spinnlou-serrate ; son 2-rowed. 



4 A. FALCATUM. Frond thick, rich green, lanceolate, pinnate, 2 3f high, with ample, 



lance-acuminate pinna?. A noble, hardy Fern from Japan. 



5 A. Floridauum (Hook). Rigidly erect, lance-oblong, pinnate and barren below, 



bipinnate, fertile, and contracted above; lower pinnre cut-pinnatifld ; indusia large, 

 round, peltate, as in No. 1. Ga., Fla., La. (A. Ludoviciana C-B.) 



6 A. aculeatum Sw. /3. JtratmH. Fronds in tufts, dark green, 2 3f, pinnate, 



lanceolate, narrowed both ways ; stipe short, shaggy with large scales ; segm. ovate- 

 falcate, auricled on the upper side, bristle-tipped. Mts., Vt. (Eaton), N. Y. 



7 A. PODOPHYLLUM (or SiEB6LDii). Fronds of two forms, thick, smooth, pinnate, with 



a few large oblong pinnae, in the fertile contracted and covered with sori. China. 



8 A. Tlielypterls Sw. Lady Fern. Frond lance-ovate, 10 AX; pn. narrow, distant, 



deeply pinnatifid, the lowest pair a? long as any; margins reflexed in fruit. 



9 A. Novaboracense Willd. New York Fern. Frond elliptic-lanceolate, 1218'; 



pn. narrow, gradually shortening from the middle both ways; Bcgm. oblong, obtuse, 

 flat; sori close to the margin, at length confluent. Moist woods : com. Delicate. 



10 A. patens Sw. Frond soft and thin, downy with rusty hairs, lance., 1218' : pn. 

 linear-oblong, pinnatifid; segm. oblong, obtuse, entire; sori scattered. Dry, Fla. 



1 1 A. MOLLE, from S. Afr. and S. Am., ia divided just like A. patens, and equally hairy, 

 but is larger, finer, with straw-colored stipes, and the sori in regular marginal rows*. 



12 A. cristatum Sw. Frond narrowly lanceolate, some 2fx6'; pn. deeply pinna- 

 tifid, triangular-oblong or -ovate, acute ; segm. toothed, bearing a single row oflarge 

 sori each side of the mid-vein. A beautiful dark-green Fern, common in woods. 



13 A. Goldiaiium Hook. Frond oval or ovate, about 15x10', stipe same length : 

 py. broad (H 2'), deeply pinnatifid ; segm. subfalcate, crenate. Woods, E. and W. 



14 A. frag rails Sw. Fronds linear-laneeolate, 6 12', tapering both ways, bipiunate ; 

 stipe short, chaffy ; pn. ovate-oblong, 1 10" ; segm. lin. -oblong, with a dozen round- 

 ish crenatures or lobes ; sori confluent. Rocks, Northern Mich, and Wis. 



1 5 A. margiiiale Sw. Fern ovate to lance-ovate, thick, glabrous, 1 2f, bipinnate , 

 stipe very chaffy at base ; pn. lanceolate; segm. oblong-falcate, obtuse and entire at 

 jipex, the lower crenate-lobed ; sori round, at or near the margin. Rocky woods. 



16 A. Fillx-mas. Fcrti lanceolate, 1 3f; stipe very chaffy; pn. triangular-lancr. ; 

 segm. oblong, obtuse, serrate at apes ; sori near the mid-vein. N. J. to Va. ? N. W. 



17 A. Hplnulosum Willd. Stipe elongated, soon smooth, the chaff deciduous ; frond 

 1 2f, ovate, acuminate, nearly or quite tripinnate; pinme lanceolate, acuminate, the 

 lower longest ; pnl. oblong, acutish, segm. mucronate-serrate. Woods and pastures. 



ft. <Hlatatun>. Stipe permanently chaffy ; frond triangular-ovate ; pnl. obtiwo 

 y. JtootHI. St'pe chaffy; frond oblong- lanceolate ; pnl. rather acute. 



