594 FILICES. (ferns.) 



2. C. bulbifera, Bernh. Fronds lanceolate, very long and attenuated nt 

 the apex, often bearing bulblets beneath, bipinnate ; pinna; triangular-laneeolate ; 

 the lowest pair largest, distant; pinnules oblong, crenately incised or toothed, 

 obtuse; indusium roundish, truncate. (Aspidium bnlbifemm, Sivarlz.) — Bocks 

 on the mountains of North Carolina, and northward. — Fronds l°-3° long. 

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

 in coining to maturity. 



13. ASPIDIUM, Swartz. Shield-Ferx. 



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

 round-rcniform and fixed at the sinus, or orbicular and fixed by the depressed 

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

 and 1 -3-pinnate fronds. 



§ 1. LASTREA, Bory. Indusium round-kidney-shaped, fired at the sinus. 



* Fronds thin and delicate, decaying in autumn ; ultimate segments entire or nearly 



so; veins simple or once forked. 



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

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

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

 revolute margin ; veins mostly forked ; indusium minute, smooth. — Swamps 

 and bogs, Florida, and northward. — 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. Nbveboracense, Willd. Fronds lanceolate, tapering both ways 

 from the middle, pinnate ; pinna lanceolate, hairy beneath along the midrib; 

 the lowest 4-6 pairs gradually smaller, distant and deflexed ; segments oblong, 

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

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



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

 cially on the veins beneath, pinnate; pinna; lancc-linear from a broad base, 

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

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

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

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

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



* * Fronds thicker; ultimate segments more or less sirrah or toothed; the lowest 



veins more than once Jbrh d. 

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

 nate or below tripinnate ; pinna- obloog-lartceolate ; the lower ones broader, 

 triangular-ovate; ultimate segments oblong, or Knear-oblong, closely set on a 

 narrowly winged partial rachis, varioOsly Incised of serrate with spmnloee teeth; 

 fruit-dots small ; indusium deciduous, sparingly glandular M flic margin. (A. 



intermedium. Muhl.) *— Shady woods in the upper districts of North Can. Una, 



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

 in outline, and in the shape of the segments. 



