FILICES. I I 3 



pairs gradually shorter and deflexed, those of the barren frond 

 broader; segments flat, oblong, basal ones often enlarged; 

 veins simple or forked in basal lobes ; sori distinct, near the 

 margin ; indusium minute, the margin x glanduliferous. (A. the- 

 lypteroides Swz., Polypodium Noveboracense L., Nephr odium 

 Noveboracense Desv., Lastrea Noveboracensis J. Sm.) North 

 Carolina to Arkansas and northward. 



9. A. conterminum Willd., var. strigosum D. C. Eaton. 

 Rootstock stout, erect, often extending a foot above the ground, 

 bearing a crown of fronds ; stipes very stout, narrowly wing- 

 margined at the base ; fronds i 4 long, lanceolate in outline, 

 caudate-acuminate, much narrowed at the base, somewhat 

 rigid, pinnate ; pinnae sessile, narrowly lanceolate from a 

 broader base, acuminate, deeply pinnatifid into oblong, ob- 

 liquely sub-falcate, obtuse segments ; under-surface copiously 

 dotted with resinous globules ; veins free, simple; sori near the 

 margin; indusium reniform, minute, glandular, somewhat 

 pilose, evanescent. (A. strigosum Fee, Nephrodium conter- 

 minum Desv. in part.) Florida. 



10. A. Nevadense D. C. Eaton. Rootstock creeping, 

 densely covered with the persistent bases of former stalks ; 

 fronds in a crown, i 3 long, lanceolate ; pinnae linear-lanceo- 

 late from a broad base, deeply pinnatifid, the lower pairs distant 

 and gradually reduced to mere auricles ; segments crowded, ob- 

 long, slightly hairy on the veins beneath, and sprinkled with 

 minute resinous particles ; veins about seven pairs to a lobe ; 

 sori close to the margin ; indusium minute, furnished with a 

 few dark-colored marginal glands, and bearing several straight 

 jointed hairs on the upper surface. California. 



11. A. oreopteris Swz. Rootstock short, erect or decum- 

 bent, scaly ; stipes short, tufted, scaly below ; fronds i^ 2 

 long, firm, membranous, broadly lanceolate, gradually tapering 

 and attenuated below, glandular ; pinnae 2' 3' long, sessile 

 from a broad base, lanceolate-acuminate, deeply pinnatifid, 

 gradually shorter to the lowest, which are more distant, deltoid, 

 and less than i' long; segments flat, nearly entire, oblong ; sori 

 quite marginal; indusia delicate, membranous, more or less 

 toothed at the margin. (Nephrodium oreopteris Desv.,N.mon- 



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