666 FILICES. (FERNS.) 



6. A. Goldianum, Hook. Frond broadly ovate, or the fertile ovate-oblong 

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

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

 shaped (9" - 15" 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. Rich 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. 



*---)--*- Large (1 3 high) : stipes very chaffy at the base : fronds twice pinnate, 

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

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



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

 pinnae 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 Tower half of each fertile pinnule. Rocky 

 woods, Keweenaw Peninsula, Lake Superior, Dr, Robbins, 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); pinnae lanceolate, broadest 

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

 tire or crenately-toothed ; 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, fixed by the depressed centre : fronds rigid and coriaceous, evergreen, 

 very chaffy on the rhachis, Sfc. : pinnce 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- 2^ high), stalked; 

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

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

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

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

 Michx.) Var. ixclsuM (A. Schweinitzii, Beck) is a state with cut-lohed pinnae, 

 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 southward along the Alleghanies. July. 



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

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

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

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

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

 and northward. (Eu.) 



