CRYPTOGAMOUS OR FLOWERLESS PLANTS. 625 



somewhat hairy beneath, broadly triangular, tripinnate; 

 pinmiles oblong or linear, entire or hastate or pinnately 

 parted; idtimate segments obtuse, oblong or linear, the 

 terminal ones often elongated, the margin reflexed or revo- 

 lute ; veins simple or forked ; indusium narrow, ciliated. 

 Common everywhere. Sti2:)e stout, 6-2° high ; frond l''-2° 

 long. 



Var. CAUDATA (P. caudata, L.), with very narrotu seg- 

 ments, the terminal ones elongated, and both surfaces of 

 the frond glabrous or even glaucous, occurs along the Gulf 

 coast. 



PELL/EA, Link. 



Fruit-dots oblong or linear at the ends of the veins, con- 

 fluent in a broad marginal line of fructification ; indusium 

 as in Pteris; veins free, forked or pinnate; fronds mostly 

 1-3-pinuate, smooth, mostly coriaceous. 



P. ATROPUiiPUREA, Link. Fronds tufted, coriaceous, 

 ovate-lanceolate, pinnate or below bipinnate; j!;i;i??fl? oppo- 

 site, rather distant, the lower ones stalked; innnules sessile, 

 oblong or linear-oblong, truncate or subcordate at the base, 

 obtuse or rarely somewhat mucronate ; indusitim formed 

 of the reflexed and little-changed margin, at length pushed 

 back and showing a broad marginal band of ripened spo- 

 rangia. (Pteris atropurpurea, L. ; Allosorus, Kunze, Gray.) 

 Mostly on lime-rock. Frond 2-12' high; stiije and rachis 

 black and shining, smooth or somewhat rusty-pubescent. 



CHEILANTHES, Swartz. 



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

 at length confluent, covered by tlie continuous or inter- 

 rupted reflexed margin of the lobes ; veins free ; fronds 

 1-3-pinnate ; pinnules with a midrib, often hairy or w^oolly. 



C. YESTiTA, Swartz. Fronds broadly lanceolate, like the 



