598 FILICES. (FERNS.) 



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

 woods, and northward. (Eu.) 



Var. IJooUii. 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. 



- *- Frond once pinnate, and the pinnce deeply pinnatifid, or at the base nearly twice 

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



4. A cristatlim, Swartz. Frond linear-oblong or 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, Swartz.) Swamps, &c. ; common. July. 

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



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

 oblong in outline (2 - 3 long), short-stalked ; pinna? (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). Rich 

 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. 



-*- H 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 pinnat ifid-toothed : fruit-dots close to the margin; the indusium tumid, 

 and its edges turnded wider. 



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

 ^ pale green ; pinna? lanceolate from a broad almost sessile base ; pinnules ob- 

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

 northward! July. 



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

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

 fronds rigid and coriaceous, evergreen, very chaffy on the rhachis, fyc. : the pinnte 

 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. fragTans, 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, DJ . Parry, and 

 high northward. 



