FILICES. 460 ASPIDIUM. 



3. A. crista'tum. Willd. Crested Shield Fern. Nephrodium. Mx. 

 Frond nearly bipinnate, lanceolate-ovate ; leaflets subcordate, oblong- 



pinnatifid, segments oblong, obtuse, ciliate-serrate ; stipe scaly. Moist woods 

 and meadows. Frond 12 — 18 inches high, pale green, remarkable for its 

 ovate-lanceolate outline. Segments of tlie leaflets sometimes 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. 



/3. Lancaslriense {Torr. A. Lancastriense. Muli.) ; /ronri rather narrowly 

 lanceolate ; Icufets nearly opposite ; stipe nearly naked ; sori dark brown. 



4. A. Goldia'num. Hook. Goldie's Fern. A. Filix mas. P. 

 Leaflets of the frond lanceolate, acuminate, deeply pinnatifid ; segments 



oblong, subacute, subfalcate, mucronate-serrate ; sori in 2 rows, each side of 

 the nerve of each segment. A tall species 2 — 3 feet high, in rocky woods. 

 Fronds numerous, bright green, scaly upon the stipe and rachis,5 — 10 inches 

 wide. Leaflets 3 — 6 inches long, not widening at base, with elongated, nar- 

 row segments. July. ' 



* * * Frond bipinnate. 



5. A. margina'le. Sw. Marginal Shield-Fern. Nephrodium. Mt. 

 Setrments of the leaflets oblong, obtuse, decurrent, crenate-sinuate, repand at 



baseflower ones almost pinnatitid ; sori marginal; stipe chaffy. A large, 

 handsome fern in rocky woods. Frond 12—18 inches high, very smooth 

 irachis a little chaffy), its divisions nearly opposite. Segments of the leaflets 

 distinct near an inch long, ^ as wiile, contracted at base, then decurrent, 

 formint^ a narrow margin along the rachis. Fruit in round dots, in regular 

 rows afong the margins of the segments. Indusium large, orbicular, with a 

 lateral sinus. July. 



6. A. te'nuk. Sw. Brittle Shield-Fern. A. fragilis. TFiZM, Cistopteris. J^crnA. 

 Sc.o-ments of the leaflets oblong, obtuse or acute, incisely serrate, approaching^ 



to plnnatifid,'its serratures subentire ; rachis winged by the decurrent leaflets ; 

 s^jwc chaffy at base. A delicate fern, on moist rocks. Fronds fi — 12 inches 

 hio-h dark oreen, its divisions rather remote, and with the subdivisions, con- 

 siderably variable in form. Sori large and numerous, near the margins of the 

 segments. June. July. 



7. A. aculea'tum. Sio. Prickly Shield-Fern. 



Seo-ments of the leaflets ovale, subfalcate, acute, aculeate-serrate, upper ones 

 truncate at base, lower cuneate at base ; only the upper leaflets fertile ; stipe 

 and rachis chaffy. Mansfield Mt., Vt., andMts. in Essex Co., N. Y. Macrae. 

 Fronds dark green, in tufts 1—2 feet high. Segments of the leaflets on very 

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

 serralure tipped with a short spinose bristle. Sori brown, in single rows, 

 distinct. Indusium reniform. Aug. 



8. A. dilata'tum. Sw. Broad Shield- Fern. A. spinulosum. Willd. 7 

 Leaflets oblong-lanceolate, distinct; segments distinct, oblong, obtuse, 



inciselv pinnatifid; ultimate segmoits mucronate-seriate ; stipe chaffy ; indu- 

 sium umhWlcate. Woods and shady pastures. Fronds 1—2 feet high, nearly 

 tripinnale, the foliajo about twice as long as wide, acuminate at apex, abrupt 

 at base. Leaflets also acuminate, but the segments ratlier obtuse, all distinct 

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

 Stipe with large, tawny scales. Sori rather large, somewhat in 2 rows. Jl. 



9. A. bulbi'ferum. Sic. Bulhiferous Shield- Fern. Cistopteris. SernA. 

 Frond bipinnate, oblong-lanceolate, segments opposite, oblong, serrate, the 



lower one pinnatifid ; rachis bulbiferous; sori roundish, the indusium attached 



