CG6 riLiCES. (kkrxs.) 



fi. A. Goldi^um, Hook. Frond In-omlli/ uvatr, or the krtWc ovatc-oWong 

 in outline (2° ~ :i° long) ; pitnue (C'-9'lony) olilong-lanccolatc, broadest in the 

 vtiddir, jiinnately parted ; the divisions (about 20 pairs) olilonr/-liiiear, sl.i(/litlij sci/the- 

 s/ia/ted (9" - 1 f)" lonj^), serrate with appressed teeth ; veins ])innately forking and 

 hcarin<^ thafruit-dots veri/ mar the midrcin ; inthisiiim very lar<;c, oibieuhir with 

 a deep narrow sinus, smooth and without marginal ghmds. — Rieh 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 Polystiehum. 



■»-•<- -1- -I- Large (l°-3° high) : stipes very chajjy at the base : fronds twice pinnate, 

 but the vpper pinnules confluent, some of the lower pinnatifid-toolhed : fruit-dots 

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



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

 pinna; 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 inciac'y 

 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 

 Avoods, Keweenaw Peninsula, Lake Sui)erior, Dr. Rohhins, and westward. — 

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



8. A. marginale, Swartz. Frond evergreen, smooth, thickish 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 bij the ileprcssed centre : fronds rigid and coriaceous, evergreen, 

 very chaffy on the rhachis, tj-c. ; pinnte or pinnules auricled at the base on the 

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

 * Fronds simply pinnate. 



9. A. acrostiehoides, Swaitz. Frond lanceolate ( 1° - 2l° high), stalked,- 

 jn'nme linear-lanceolate, somewhat scythe-shaped, half-halberd-shaped at the 

 slightly stalked base, serrulate with appressed bristly teeth ; the fertile (nitpur) 

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

 are confluent with age, covering the surface. (Xephrodium acrostiehoides, 

 Michx.) — Var. ixcisuM (A. Schweinitzii, Beck) is a state with cut-lobed pinna;, 

 a not unfrequent 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 soutliward along the Allcghanics. July. 



10. A. Lonehitis, Swart/,. Frond lincnr-lanccolate (9' -20' liigh), sram'/;/ 

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

 strongly auricled on the ui)per side and wedge-truncate on the lower, densely 

 spinulosc-toothed (1' or less in l?ngth), copiou.sIy fruit-bearing; fruit-dots con- 

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

 and northward. (Ku.) 



