382 CRYPTOGAMIA.— FILICES. 



nate ,• divisions lanceolate, pinnatifid ; segments 

 oblong, obtuse, with remote uncinate serratures, 

 the lowest decurrent on the rachis ; sori near the 

 central nerve ; stipe and rachis somewhat chaffy. 

 HAB. Rocky woods. July. Frond very broad, 2 

 ft. high ; invol, peltate. 



6. A.marginale: frond bipinnate ; segments oblong. 



obtuse, decurrent, crenate, sinuate-repand at the 

 base ; sori marginal ; stipe paleaceous. 

 HAB. Rocky places. July. Frond 18 in. high, 

 very smooth; invol. large, umbilicate. 



7. A. spinulosum : frond bipinnate ; divisions oblong. 



decurrent, smaller segments mucronately serrate ; 



stipe paleaceous ; involucrum glandular. 

 HAB. Rocky woods. July. Frond broad, slender. 



smooth ; sori small. 

 3. A.dilatatum: fronds bipinnate; divisions oblong, 



distinct, incisely pinnatifid ; segments mucronately 



serrate ; stipe chaffy ; involucrum smooth. 

 HAB. Shady woods. July. Frond broad, 2 ft* 



high ; stipe slightly chaffy. 



* * Involucrum oblong, opening on one side. 

 #. A. asplenioides : frond bipinnate ; segments lanceo 



late, incisely serrate ; serratures 2= — 3-toothed ; 



sori oblong, lunate. 

 HAB. Moist woods. Two ft. high; frond smooth ; 



sori at length subconfluent. 



* * * Involucrum hemispherical, bursting at the top. 



10. A. tenue : frond bipinnate; segments ovate, de- 

 current, dentate ; sori solitary, near the teeth of 

 the leaflets. 



HAB. Rocks. Cespitose, 6 — 3 in. high, slend. ; sori 

 large ; invol. deciduous, 



1 1. A. bidbiferum: frond bipinnate, lanceolate, attenu- 

 ate above ; segments oblong, obtuse, serrate, the 

 inferior ones pinnatifid ; rachis bulbiferous ; sori 

 minute. 



H\B. Rocky woods. Frond narrow and long, IS 

 in. high ; bulbs ovate, compress., green. 



12. A. punctilobulum : frond bipinnate, oblong; divi- 

 sions oblong, pinnatifid ; segments with the supe- 



