54 



POLYPODIACEAE 



N. Y. The Catskills in Ulster, Delaware and Greene counties. 

 Pa. The mountains of Luzerne Co. 



Tertiary, o: Cretaceous, o: Older Formations, rare and local at 

 high elevations. Not south of the moraine. H7-I43days. 1450- 

 4020 ft. 



7. Dryopteris Adans. 



Indusia present. 



Texture membranous; veins simple or once forked. 



Lower pinnae gradually and conspicuously reduced. 

 Lower pinnae scarcely or not reduced. 



Veins once or twice forked, at least in the sterile 



leaves. 

 Veins simple. 

 Texture firmer, sometimes subcoriaceous; veins freely 

 branched. 

 Blades 2-pinnatifid or 2-pinnate; segments not spinu- 

 lose, leaves lM° _ 5° high: rachis naked or decid- 

 uously chaffy: indusia not glandular. 

 Indusia flat, thin. 



Blades narrow, linear-oblong to lanceolate; 

 sori nearly medial; scales at base of stipe 

 light brown, concolorous. 

 Blades broader, narrowly oblong, ovate or tri- 

 angular ovate; sori near the midvein. 

 Apex not abruptly acuminate, pinnae 

 broadest at base; sori 3-7 pairs; scales 

 at base of stipe brown with dark 

 centers. 

 Apex short-acuminate, often abruptly so; 

 pinnae broadest above the base; sori 

 6-10 pairs, scales of stipe more or less 

 blackish-brown. 

 Indusia convex, firm; sori close to the margin. 

 Blades 2-3-pinnate; segments spinulose or mucronate; 

 blades ovate-lanceolate, triangular, or broadly 

 oblong, usually not narrowed below. 

 Indusia glabrous or nearly so; pinnae usually 

 somewhat oblique to the rachis, the lowest 

 broadly and unequally ovate to triangular. 

 Pinnules flat, decurrent; sori terminal on the 

 veinlets; indusia glabrous; scales pale, con- 

 colorous; leaves 3H' -0 ' broad. 

 Pinnules concave, some not decurrent; sori 

 mostly subterminal; indusia glabrous or 

 with a few glands; scales dark brownish; 

 leaves ample, 4'-l6' broad 

 Indusia glandular; pinnae usually at right angles, 

 the lowest unequally lanceolate to ovate-lanceo- 

 late. 



I. D. noveboracensis. 



2. D. Thelypteris. 



3. D. simulate. 



4. D, cristata. 



5. D. Clintoniana. 



6. D. Goldieana. 



7. D. marginalis. 



8. D. spinulosa. 



9. D. dilatuta. 



10. D. intermedia 



