666 FiLiCEs. (ferns.) 



6. A. Goldi&num, Hook. Fronrf iroat/Zi/ orate, or the fertile ovate-oblong 

 in outline ( 2° -3° long) ; pinna; (6'-9'long) oblong-lanceolate, broadest in the 

 middle, pinnately parted ; the divisions {about 20 pairs) oblong-linear, slightli/ sci/the- 

 shaped ( 9" - 1 .5" long), serrate with appressed teeth ; veins pinnately forking and 

 bearing the fruit-dots very near the midvein ; indusium very large, orbicular with 

 a deep narrow sinus, smooth and without marginal glands. — Eich and moist 

 woods, from Connecticut to Kentucky, and northward. July. — A stately Fern, 

 often 4° high, the fronds growing in a circle from a stout ascending chaffy root- 

 stock, and decaying in autumn. Indusium with the sides of the sinus often 

 overlapping, thus appearing to be round and entire as in Polystichum. 



I- H — 1 — I- Large (l°-3° high) : stipes very chaffi/ at the base : fronds twice pinnate, 

 hut the upper pinnules confluent, some of the lower pinnatifid-toothed : fruit-dots 

 rather large : the indusium convex, without marginal glands, persistent. 



7. A. Pilix-mas, Swartz. Frond lanceolate in outline (l°-3° liigh); 

 pinnse linear-lanceolate, tapering from base to apex ; pinnules oblong, very ob- 

 tuse, serrate at the apex, and obscurely so at the sides, the basal ones incisely 

 lobed, distinct, the upper confluent; fruit-dots nearer the midvein than the 

 margin, and usually confined to the lower half of each fertile pinnule. — Rocky 

 woods, Keweenaw Peninsula, Lake Superior, Dr. liohbins, and westward. — 

 Frond thiekish but not surviving the winter. (Eu.) 



8. A. margiu^le, Swartz. Frond evergreen, smooth, thiekish and almost 

 coriaceous, ovate-oblong in outline (l°-2° long); pinna; lanceolate, broadest 

 above the base ; pinnules oblong or oblong-scythe-shaped, crowded, obtuse, en- 

 tire or crenately-toothcd ; fruit-dots close to the margin. — Rocky hillsides in 

 rich woods : common, especially northward. Aug. 



§ 2. POLYSTICHUM, Roth. (Aspidium, Hook.) Indusium orbicular and 

 entire, peltate, fxed by the depressed centre ; fronds rigid and coriaceous, evergreen, 

 very chaffy on the rhachis, Sf-c. : pinnae or pinnules auricled at the base on the 

 upper side, crowded, the teeth or lobes bristle-tipped. 

 * Fronds simply pinnate. 



9. A. acrostichoides, Swartz. Frond lanceolate (1°-2J° high), .<i/a;fa7; 

 pinnce linear-lanceolate, somewhat scythe-shaped, half-halberd-shajjcd at the 

 slightly stalked base, serrulate with appressed bristly teeth ; (/le yiTf/fe (upper) 

 ones contracted and smaller, bearing contiguous fruit-dots near the midrib, which 

 are confluent with age, covering the surfirce. (Nephrodium acrostichoides, 

 Michx.) — Var. ixcisfji (A. Schweinitzii, Beck) is a state with cut-lobed pinnse, 

 a not unfrequcnt case in the sterile fronds ; sometimes the tips of almost all of 

 them fertile more or less. — Hillsides and ravines in woods : common north- 

 ward, and southward along the Alleghanies. July. 



10. A. Lonchitis, Swartz. Frond linear-lanceolate (9' -20' high), srarre(y 

 stalked, very rigid; pinnm broadly lanceolate-scythe-shaped, or the lowest triangular, 

 strongly auricled on the upper side and wedge-truncate on tlie lower, densely 

 spinulose-toothcd (1' or less in length), copiously fruit-bearing; fruit-dots con- 

 tiguous and near the margins. — "Woods, southern shore of Lake Superior, 

 and northward. (Eu.) 



