FILICES. 1 1 5 



phrodium fragrans Rich.) New England, New York to Wis- 

 consin, and northward. 



\\ Fronds larger, mostly 2 4 high. 



A. Fronds bipinnatifid or nearly twice pinnate ; indusia 

 large, thinnish and flat, 



16. D. Floridana (Hook.) Ktze. Stipes 6' 10' long, spar- 

 ingly clothed with ovate scales; fronds lanceolate, 18 20' 

 long, 5' 8' broad; fertile pinnae confined to the upper half of 

 the frond, narrowly lanceolate, cut down to the narrowly 

 winged secondary rachises into oblong, distinct pinnules; the 

 sterile pinnae broader, shorter, and sub-deltoid below, less 

 deeply cut. (Aspidhim Floridanum D. C. Eaton, Nephro- 

 dium Floridanum Hook.) Florida. 



17. D. cristata (L.) Gray. Fronds linear or lanceolate in 

 outline, i 2 long; pinnae short, 2' 3' long, triangular-ob- 

 long or the lowest nearly triangular, deeply pinnatifid ; seg- 

 ments 6 10 pairs, finely serrate or cut-toothed ; sori as near 

 the midvein as the margin; indusia smooth, naked. (A. Lan- 

 castriense Spreng., Nephrodium cristatum Michx., Lastrea cris- 

 tata Presl.) Canada to Arkansas. 



Var. Clintoniana(Eat.)Unde. Fronds much larger, 2^ 4 

 long ; pinnae oblong-lanceolate, broadest at base, 4' 6' long, 

 i' 2' broad, deeply pinnatifid; segments 8 16 pairs, crowded 

 or distant, linear-oblong, obscurely serrate; veins pinnately 

 forking, bearing the sori near the midvein. New England, 

 New York, and westward. 



/ H-O^ 18. D. Goldieana (Hook.) Gray. Fronds broad, 2 4 

 long; pinnae 6' 9' long, broadest in the middle, pinnately 

 parted ; the segments about 20 pairs, oblong-linear, sub-falcate, 

 serrate with appressed teeth ; veins bearing the sori very near 

 the midvein ; indusia very large, orbicular with a narrow sinus. 

 {Nephrodium Goldieanum Hook., Lastrea Goldieana J. Sm.) 

 Canada to Kentucky. 



B. Fronds mostly bipinnate ; indusia convex, without mar- 

 ginal glands. 



19. D. filix-mas (L.) Schott. (MALE-FERN.) Rootstock 

 stout; fronds in a crown, i 3 high, broadly oblong lanceo- 

 late, slightly narrowed toward the base, bipinnatifid or bipin- 



