626 FILICES. (FERNS.) 



3. P. serrulata, L. f. Frond bipinnatifid ; pinnae 12 or more, in oppo- 

 site pairs, decurrent, the lower linear, piunatifid ; otherwise nearly as the last. 



South Carolina and Alabama. 



3. P. aquilina, L. (BRAKE.) Fronds large, glabrous or somewhat 

 hairy beneath, broadly triangular, tripinnate; pinnules oblong or linear, 

 entire or hastate or pinnately parted ; ultimate segments obtuse, oblong or 

 linear, the terminal ones often elongated, the margin reflexed or revolute ; 

 veins simple or forked ; indusram narrow, ciliated. Common everywhere. 



Stipe stout, 6' - 2 high. Frond 1 - 2 long. 



Var. caudata (P. caudata, L.}, with very narrow segments, the terminal 

 ones elongated, and both surfaces of the frond glabrous or even glaucous, 

 occurs in South Florida and along the Gulf coast. 



6. PELLJEA, Link. 



Fruit-dots oblong or linear at the ends of the veins, confluent in a broad 

 marginal line of fructification. Indnsium as in Pteris. Veins free, forked or 

 pinnate. Fronds mostly 1 3-pinnate, smooth, mostly coriaceous. 



1. P. atropurpurea, Link. Fronds tufted, coriaceous, ovate-lanceo- 

 late, pinnate or below bipinnate ; pinnae opposite, rather distant, the lower 

 ones 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. Mountains of Alabama, and 

 northward, mostly on lime-rock. Frond 2'- 12' high. Stipe and rachis black 

 and shining, smooth or somewhat rusty-pubescent. 



7. 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-pinuate ; pinnules with a midrib, often hairy or woolly. 



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

 pinnate; pinnae ovate-lanceolate, deeply pinuatifid, or the lower ones again 

 pinnate; pinnules ovate-oblong, rather obtuse, often auriculate at the upper 

 side of the base, glabrous, the margin reflexed and forming a mostly continu- 

 ous membranaceous involucre. Limestone cliffs on the Tennessee and French 

 Broad Rivers, Alabama, etc., Buckley. Fronds 4' -6' long, on slender black 

 and polished stipes 2' -4' long, pulverulent along the upper side, and some- 

 what chaffy at the base. 



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

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

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

 ceous 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 pinine ovate-oblong ; ultimate segments minute, round- 





