598 FILICES. (FERNS.) 



or rather scythe-shaped. N. New England to "Wisconsin, chiefly in mountain 

 woods, and northward. (Eu.) 



Var. lioottii. Frond elongated-oblong or elongated-lanceolate in outline; 

 pinnules broadly oblong, very obtuse, the lower pinnatifid, the upper and smaller 

 merely serrate ; indusium minutely glandular. (A. Boottii, Tuckerm. Dryop- 

 teris rigida, ed. 1 ; not Aspidium rigidum, Swartz.} E. Massachusetts, Boott, 

 &c. Connecticut, D. C. Eaton, and northward. The least dissected form, in- 

 termediate in appearance between A. spinulosum and A. cristatum, but passing 

 into the former. 



t- - Frond once pinnate, and the pinnae deeply pinnatijid, or at the base nearly twic& 

 pinnate: fruit-dots within the margin, large ; the indusinm thinnish and flat. 



4. A cristfatiiin, Swartz. Frond linear-oblong en- lanceolate in outline 

 (l to 2J long and very long-stalked) ; pinnce. short (2' -3'), triangular-oblong, 

 or the lowest nearly triangular-ovate, from a somewhat Heart-shaped base, acute, 

 deeply pinnatifid; the divisions (8- 13 pairs) oblong, very obtuse, finely serrate or 

 cut-toothed, the lowest pinnatifid-lobed ; fruit-dots as near the midrib as the margin, 

 often confluent. (A. Lancastriense, Sicartz.) Swamps, &c. ; common. July. 

 Stalk bearing broad and deciduous chaffy scales. (Eu.) 



5. A. Goldifimim, Hook. Frond broadly ovate, or the fertile ovate- 

 oblong in outline (2 -3 long), short-stalked; pinnae (6' -9' long) oblong-lan- 

 ceolate, pinnately parted ; the divisions (about 20 pairs) oblong-linear, slightly 

 scythe-shaped, obtuse (!' long), serrate with appressed teeth, bearing the distinct 

 fruit-dots nearer the midrib than the margin (these smaller than in No. 4). Kich 

 and moist woods, from Connecticut to Kentucky, and northward. Sept. A 

 stately species, often 4 high ; the fronds decaying in autumn. Indusium often 

 orbicular without a distinct sinus, as in Polystichum. 



-*- Fronds (thickish and mostly persistent through the winter, as in Poly- 

 stichum), twice pinnate, but the nearly entire upper pinnules confluent, some of 

 the lower pinnatifld-toothed : fruit-dots close to the margin ; the indusium tumid, 

 and its edges turnded under. 



6. A. Hiarginale, Swartz. Frond ovate-oblong in outline (1- 2 long), 

 pale green ; pinnae lanceolate from a broad almost sessile base ; pinnules ob- 

 long, obtuse, crowded. Rocky hill-sides in rich woods ; common, especially 

 northward. July. 



$2. POLYSTICHUM, Roth. Indusium orbicular and entire, peltate, (or rarely 

 round-kidney-shaped in the same species, as in No. 7,)jixed by the depressed centre: 

 fronds rigid and coriaceous, evergreen, very chaffy on the rhachis, S(-c. ; the pinnae, 

 or pinnules auricled at the base on the upper side, crowded, the teeth or lobes bristle- 

 tipped. 



* Fronds twice pinnate or nearly so. 



7. A. fra grans, Swartz. Fronds (4' -9' high) glandular and aromatic, 

 pinnate, with the linear-oblong pinna? pinnately parted ; their crowded divisions 

 (2" long) oblong, obtuse, covered with the fruit-dots, the rusty-brown great in- 

 dusia nearly equalling them in breadth; rhachis, &c. chaffy with very large 

 scales. Shaded trap-rocks, Falls of the St. Croix, Wisconsin,, Di . Parry, imj 

 high northward. 



