598 FILICES. (FERNS.) 



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

 woods, and northward. (Ea.) 



Var. Io6t tie. 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 rigid um, Swartz.) E. Massachusetts, Boolt, 

 &e. Connecticut, D. C. Eaton, and northward. The least dissected fonn, 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 Jlat. 



4. A. cristfitum, Swartz. Frond linear-oblong or lanceolate in outline 

 (1 J 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, Su-artz.) Swamps, &c. ; common. July. 

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



5. A. Ooldiiinum, 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). 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. 

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



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



the, lotcer pinnated-toothed : fruit-dots close to the margin ; the indusium tumid, 



and its edges turned under. 



C. A. Niarginnle, Swart?;. 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 POLYST1CIIUM, Roth. Indusium orbicular and entire, peltate, (or rarely 

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

 fronds rigid and coriaceous, evergreen, very chaffy on the rhachis, frc. : the pinna 

 or ]>innules auriclcd 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 division 

 (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. Dr. Pany, and 

 high northward. 



