POL YPODIA CE^. 1 1 3 



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

 dium Floridanum Hook.) Florida. 



11. 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, 2j° — 4° 

 long ; pinnse 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. {D. Goldieana celsa 

 Palmer.) New England, New York, and westward. 



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

 long; pinnse 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. 



13. D. filix-mas (L.) Schott. (Male-fern.) Rootstock 

 stout; fronds in a crown, 1° — 3° high, broadly oblong lanceo- 

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

 nate; pinnules oblong, smooth, polished beneath, the larger 

 ones pinnately incised ; sori large, near the midvein, commonly 

 on the lower half or two thirds of the segment ; indusia firm, 

 smooth; rachis more or less chaffy. (Nephrodium filix-mas 

 Rich., Lastrea filix-mas Presl.) Canada to Colorado, Arizona, 

 California, and Oregon. 



14.- D. marginalis (L.) Gray. Fronds nearly coriaceous 

 in texture, 6' — 2° long, ovate-oblong ; pinnse lanceolate, broadest 

 just above the base ; pinnules oblong or oblong-falcate, entire 

 or crenately toothed ; sori close to the margin. {Polypodium 

 marginale "L., Nephrodium marginale Michx., Lastrea margi- 



