FILICES. 449 



subsessile, upper ones smaller and alone fertile ; sori at length conflu- 

 ent ; stipe and rachis chaffy. Nephrodium acrostichoides Mich. 



HAB. Rocky and low shady places. Can. to Car. W. to Miss. 

 June Aug. If. Fern 12 18 inches high. Stipe short, pale 

 and with the rachis chaffy. Frond long, pale green. Sori in a 

 single or double row, at length confluent. 



2. A. schioeinitzil Beck : frond pinnate ; pinnae linear-lanceolate, 

 falcate, doubly serrate, auricled at the upper angle of their base ; sori 

 on the upper pinnae, distinct, in two rows, one on each side of the 

 midrib. 



HAB. N. J. Schweinitz. Near Philadelphia. Conrad. Fern 

 larger than the preceding and differing considerably in its ap- 

 pearance. PinntB, especially the lower ones, deeply and doubly 

 dentate-serrate, the teeth or serratures armed with stiff bristles. 

 Sori continuing perfectly distinct. Nearly allied to A. auricu- 

 latum of Sicartz, and may be the same as that mentioned by Sir 

 J. E. Smith under the description of that plant, (Rees' CycL 

 Supp. art. dspidium,} said to have been brought from the-N. W. 

 Coast by Menzies. 



.*<; ** Fronds lipinnatifid. 



3. A. ikelypteris Wllld. : frond pinnate; pinnce lanceolate, deeply 

 pinnatifid, distinct, but sometime^ crossing each other set base ; seg- 

 ments oblong, acute, somewhat crenate, ciliate ; sori marginal, at 

 length confluent. 



HAB. Wet woods and swamps. Can.- and N. S. July. If. 

 Fern a foot or more high. Root creeping. Stipe smooth ; 

 rachis and midrib often a little hairy. Frond lanceolate, deep 

 green and delicate. 



4. A. noveboraccnse Wllld. : frond pinnate ; pinnae linear- lanceo- 

 late, deeply pinnatifid ; segments oblong, obtuse, entire, ciliate; sori 

 marginal ; stipe smooth. A. t/ielypterioides Swartz. Nephrodium the- 

 typterioides Mich. 



HAB. Damp woods. Can. to Car. July. ' If. Fern about the 

 size of the last but of a more rigid habit. Segments of the 

 pinnce, usually quite entire and obtuse. Sori at length confluent 

 and partly covered by the margin of the frond. Closely re- 

 sembles the preceding, from which it may still not be distinct. 



5. A. cristatum Willd. : frond pinnate, nearly bipinnate, lanceolate- 

 ovate ; pinnae subcordate, oblong, pinnatifid ; segments oblong, obtuse, 

 dentate-serrate ; stipe scaly. Nephrodium cristatum Mich. 



HAB. Moist grounds. Can. and N. S. July. If. Fern a foot 

 or more high. Frond pale green, with a lanceolate-ovate out- 

 line. Sori large, in double rows, tawny when mature, mostly 

 on the upper half of the frond. 



6. A. lancastriense Sprang. : pinnae subopposite, lower ones trian- 

 gular-ovate ; segments toothed ; stipe nearly naked. 



HAB. Woods. N. Y. Mass. N. J. ; not common. Juiy. If. 

 Fern 18 24 inches high. Stipe nearly smooth. Frond large, 

 much narrower and more rigid than in the preceding ; it is also 



3d* 



