FILICES. 1 1 5 



pJu'odimn fragratts Rich.) New England, New York to Wis- 

 consin, and northward. 



II Fronds larger, inosfly 2° — 4° high. 

 A. Fronds bipitttiatifid or nearly tivicf pinnate ; indiisia 

 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. {Aspidiuni Floridanuni D. C. Eaton, iXephro- 

 diuni Floridafinni Hook.) Florida. 



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

 outline, 1° — 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., NepJirodiuni cristattini 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 pinnalely 

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

 New York, and westward. 



18. D. Goldieana (Hook.) Gray. Fronds broad, 2° — 4" 

 long; pinnae 6'^g' 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. 

 {Nephrodiuni Goldieanitni 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- 



