FILICES. 115 



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. A. Floridanum D. C. Eaton. Stipes 6' 10' long, 

 sparingly 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. (A. cristatum, var. Floridanum Hook., Nephro- 

 dium Floridanum Hook.) Florida. 



17. A. cristatum Swz. Fronds linear-oblong 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. Clintonianum D.C.Eaton. 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 pin- 

 nately forking, bearing the sori near the midvein. New Eng- 

 land, New York, and westward. 



^18. A. Goldieanum Hook. Fronds broadly ovate, 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. A. filix-mas Swz. (MALE-FERN.) Rootstock short, 

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

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



