598 FILICES. (FKRNS.) 



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

 woods, and northward. (Eu.) 



Var. ESooftii. 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, Tuehnn. Dryop- 

 teris rigida, cd. 1 ; not Aspidium rigidum, Swartz.) E. Massachii>ett,s, 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, andthepinnce deeply pinnalifid, or at the base nearly twice 

 pinnate: fruit-dots within the margin, large; the indusiinn tliinnish and fiat. 



4. A. Cl'iStfltimi, Swart/. Frond linear-oblong or lannolale in outline 

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

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

 deeply pinnatih'd ; 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. GoldiHIllim, Hook. Frond broadly ovate, or the fertile ovate- 

 oblong in outline (2 -3 long), short-stalked ; pinna? (G'- 9' long) oblong-lan- 

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

 scythe-shaped, obtuse (!' long), sen-ate with appresscd teeth, bearing the distinct 

 fruit-dots nearer the midrib than the man/in (these smaller than in No. 4). Rich 



and moist woods, from Connecticut to Kentucky, and northward. July- 

 Sept. A stately species, often 4 high; the fronds decaying in autumn. In- 

 dusium often orbicular without a distinct sinus, as in Polystichum. 

 .*- -- Fromls (thickisli and most 1 1/ persistent through the winter, as in Poly- 

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

 the lower pinnatijid-toothed : fruit-dots close to the margin; the indusium tui'ni<l, 

 and its edges turned under. 



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

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

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

 northward. July. 



2 rOLYSTICHUM, Roth. Tndusium orbicular and entire, peltate, (or ranlj 

 round-kidney -shaped in the same species, as in No. 7,).//.m/ by the dpnsmd centre: 

 fronds rigid and coriaceous, evergreen, very cluijj'i/ on the rhachis, frc. : 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. frfi grans, Swartz. Fronds (4 1 - 9' high) ylandnlnr and aromatic, 

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

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

 du-ia ii.-arly equalling them in breadth; rhachis, ,-. chaliy with very large 

 scales. Shaded trap-rocks, Falls of the St. Croix, Wisconsin, Dr. Parry, and 

 high northward. 



