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, Z. AUosorus, A'unse, 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, Swartz. 



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, BucUei/.) — Limestone cliffs 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. vestita, Swartz. Fronds broadly lanceolate, like the stalks hirsute 

 with rusty hairs, bipinnate; pinnte triangidar-ovate ; pinnules oblong, obtuse, 

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

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

 long, becoming smooth aliove. 



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

 clothed with white deciduous hairs, beneath denselj' tomentose with brownish- 

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

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

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

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

 south westward — 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 tlie 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. 



