and at length covered by the numerous sori. 
In dry, deciduous woods. 
The form acrosticJioides Sckweifjttzit (^Qck) Small, having 
toothed or incised pinnae, has been observed bj M. J. H. Paiiitcr 
at Cabin John, Md. 
18. DRYOPTERIS Adans. 1763. 
Rootstock creeping or stout, ascending. Leaves 2-3 
pinnatifid. Sori orbicuhxr. Indusium reniform or orbicu- 
lar, fixed by its sinus. 
t Leaves 2-pinnatifid^ plmiae linear-lanceolate . 
* Pinnae i cm. more or less wlde^ sessile^ tapering 
both ways, 
1. D. noveboracensis (L.) A. Gray, 
Polypodiu77i noveboracense L, Sp. PI. 1091. 
Aspidlufn noveboracense Sw , Schrad. Journal 
Bot. 1800: 2: 38. Eaton^ Ferns N. Am. i : 
49. t.7 ; in Gray, Man. 687. Clute^ Ferns 120. 
Nephrodlum noveboracense Desv , 1827. Mem. 
Soc. r.inn. Paris, 6: 2 pt. 257. Waters^Y^xw^ 
209. 
Dryopteris noveboracensis A, Gray^ 1848. Man. 
630. Und, inlU. Fl. I : 15; Nat. Ferns iii ; 
in P>ritt. Man. i4. 
Nkw York Ficrn. 
40 
