6'J4 FiLiCKS. (kerns.) 



2. C. bulbifera, Btmli. Fronds lanceohitp, very long and attenuated at 

 tJic ajHX, often biaiinj; Imllilcts beniatli, liipinnato; pinna; tiianpular-lanceolate ; 

 tlic lowest ]>air lar;,a'St, distant ; ])innulcs oldonj:, cirnatcly incised or tootiied, 

 obtuse; indusiuni roiindisii, truncate. (Aspidiimi hnlliiferuni, .SVtnV; ) — Rocks 

 on the mountains of Nortli Carolina, and norlliward. — Fronds l°-3° long. 

 The bulblets fall to the ground, and form new plants, wliieli are about two years 

 in coming to maturity. 



13. ASPIDIUM, Swartz. Shield-Fern. 



Fruit-dots round, borne on the veins mostly below their apices. Indusium 

 round-reniform and fixed at the sinus, or orbicular and fixed by the dei)resRcd 

 centre. Veins with acute or attenuated apices. Our species have free veins 

 and 1 - 3-pinnatc fronds. 



Ij 1. LASTREA, Bory. Indusium round-kuhcy-shapi:d, fixed at the siuus. 



* Fronds thin and delicate, decnifing in autumn; ultimate ser/meuts entire or neaili/ 



so; veins simple or once forked. 



1. A. Thelypteris, Swartz. Fronds smooth, ovate-lanceolate, pinnate; 

 pinna; lanceolate, often recurved, deeply pinnatifid ; the lowest 1-2 pairs rather 

 .smaller ; segments oblong, obtuse, nearly entire, the fertile ones witii a strongly 

 rcvolute margin ; veins mostly forked ; indusiuni minute, smooth. — Swamps 

 and bogs, Florida, and nortliward. — Fronds 10'- 18' long, with an elongated 

 stipe. This species and the next one have slender, nearly naked rootstocks, 

 which creep several inches in advance of the fronds. 



2. A. Noveboracense, AVilld. Fronds lanceolate, tapering both ways 

 from the.middie, pinnate ; pinnae lanceolate, hairy beneath along the midrib ; 

 the lowest 4-6 pairs gradually smaller, distant a<id dcflexed ; segments oblong, 

 obtuse, nearly entire ; veins simple ; indusium minute, smooth. — Low grounds. 

 North Carolina, and northward. — Fronds l°-2° long, on rather short stipes. 



3. A. patens, Swartz. Fronds ovate or oblong-ovate, pubescent, espe- 

 cially on the veins beneath, pinnate ; pinnaj lance-linear from a broad base, 

 deeply pinnatifid ; the lowest pair a little smaller and reflexed ; segments 

 oblong, often falcate, entire, or the upper basal one enlarged and pinnatifid ; 

 veins simple, free, or the basal ones meeting at the sinus between the segments ; 

 indusium small, pubescent. (A. molle, Kunze in Sill. Jour.) — Low shady woods, 

 Florida to South Carolina, and westward. — Fronds l°-3° high. 



* * Fronds thicker; idtimate segments more or less serrate or toothed ; the lowest 



veins more than once forked. 



4. A. spinvilosum, Swartz. Fronds ovate-oblong, thin, smooth ; bipin- 

 nate or below tripinnate ; pinna; oblong-lanceolate ; the lower ones broader, 

 triangular-ovate ; ultimate segments ol)Iong, or linear-oblong, clo.sely set on a 

 narrowly winged partial rachis, variously incised or serrate w ith spinulose teeth ; 

 fruit-dots small ; indusium deciduous, sparingly glandular at the margin. (A. 

 intermedium, Muhl.) — Shady woods in the upper districts of North Carolina, 

 Tennessee, and northward. — Fronds l°-2° long, 5'- 9' wide, varying greatly 

 in outline, and in the shape of the segments. 



