590 FILICES. (FERNS.) 



stalked ; pinnules sessile, oblong or linear-oblong, truncate or subcordate at the 

 base, obtuse or rarely somewhat mucronate ; indusium formed of the reflexed 

 and little-changed margin, at length pushed back and showing a broad marginal 

 band of ripened sporangia. (Pteris atropurpurea, L. Allosorus, Kunze, Gray.) 

 Mountains of Alabama and northward, mostly on lime-rock. Frond 2'- 

 12' high. Stipe and rachis black and shining, smooth or somewhat rusty- 

 pubescent. 



6. CHEILANTHES, Swam. 



Fruit-dots at the thickened ends of the veins, distinct or at length confluent, 

 covered by the continuous or interrupted reflexed margin of the lobes. Veins 

 free. Fronds 1 -3-pinnate ; pinnules with a midrib, often hairy or woolly. 



1. C. Alabamensis, Kunze. Fronds broadly lanceolate, subcoriaceous, 

 pinnate ; pinna? ovate-lanceolate, deeply pinnatifid, or the lower ones again pin- 

 nate ; pinnules ovate-oblong, rather obtuse, often auriculate at the upper side of 

 the base, glabrous, the margin reflexed and forming a mostly continuous mem- 

 branaceous involucre. (Pteris Alabamensis, Buckley.) Limestone cliff's on the 

 Tennessee and French Broad Rivers, Alabama, &c., Buckley. Fronds 4' -6' 

 long, on slender black and polished stipes 2' -4' long, pulverulent along the 

 upper side, and somewhat chaffy at the base. 



2. C. VGStita, Swartz. Fronds broadly lanceolate, like the stalks hirsute 

 with rusty hairs, bipinnate ; pinna? triangular-ovate ; pinnules oblong, obtuse, 

 more or less incised; the ends of the lobes reflexed to form separate herbaceous 

 involucres. Near Augusta, Georgia, Kunze, and northward. Fronds 4' - 8' 

 long, becoming smooth above. 



3. C. tomentosa, Link. Fronds broadly lanceolate, tripinnate, above 

 clothed with white deciduous hairs, beneath densely tomentose with brownish- 

 white wool ; primary pinnae ovate-oblong ; ultimate segments minute, round- 

 obovate, sessile or adnate-decurrent, the margin reflexed forming a continuous 

 somewhat mcmbranaceous involucre. ( C. Bradburii, Hook., at least as to Lind- 

 heimer's plant.) French Broad River, North Carolina and Tennessee, and 

 southwestward. Frond 6' -12' long. Stipe and rachis whitish with long 

 paleaceous hairs. 



7. ADIANTUM, L. MAIDENHAIR. 



Indusium orbicular or transversely elongated, formed of a reflexed and altered 

 portion of the margin of the frond, bearing the sporangia on its under side at 

 the ends of the veins. Midrib none or eccentric : veins forking, mostly free. 

 Stipe and rachis commonly black and shining. 



1. A. pedatum, L. Stipe long and slender, forked, the spreading and 

 recurved branches bearing on the outer side several slender horizontal pinnate 

 divisions ; pinnules numerous, alternate, short-stalked, oblong, entire on the 

 lower side, the upper margin cleft and fruit-bearing. Shady woods, North 

 Carolina, and northward. Stipe 8' -12' high. The most graceful of all our 

 Ferns. 



