POLYPODIACEAE. H 



Stipes blackish throughout; lobes acute or acuminate. 



2. A. ehenoides. 

 Leaves once pinnate. 



Pinnae 7 mm. to 8 cm. long, mostly blunt. 



Pinnae auricled at upper side of base. 3. A. iilatyneuron. 

 Pinnae not auricled, partly alternate, partly opposite. 



4. A. Trichomanes. 

 Pinnae 5-12 cm. long, acute or acuminate. .5. A. angustifolium. 



Leaves 2-3 pinnatifid. 



Stipes green; leaves ovate-deltoid; pinnules fan-shaped, veins fla- 

 bellate. 6. ^. Euta-muraria. 



Stipes dark at the base, green above. 7. A. montanum. 



Stipes chestnut-brown throughout, as also the lower part of the 

 rachis. 8. A. Bradleyi. 



Sori usually more or less curved, sometimes horseshoe-shaped, often crossing 

 to the outer or lower side of the veinlet ; large ferns. 

 Leaves 2-pinnatifid, segments blunt, scarcely crenate. 



9. A. acrostichoides. 

 Leaves 2-pinnate; pinnules acute, toothed or pinnatifid. 



10. A. Filix-foemina. 



1. AsPLENiUM PiNNATiFiDUM Xutt. M. p. 11. Rocks. Summer. 



Philadelphia— Wissahiekon, Mart. (B. C), Falls of Schuylkill (Je.). 

 Z>da (fare— Ridley Creek, T. C. Palmer (Fu.). Lancaster— York Furnace, 

 Tucquan, Georgetown (P.). 



2. AsPLENiUM EBENOiDES R. R. Scott. M. p. 11. Limestone. Summer. 



Montgomery— Yiast side Schuylkill (C. E. S.). Lancaster— York Fur- 

 nace (Cr.). Lehigh— (P.). Northampton— Glendoa. (P.). 



3. ASPLENIUM PLATYNEURON (L.) Oakes. M, p. 11. Rocky open woods. 



Summer. 



4. ASPLENIUM TRICHOMANES L. M. p. 11. Shaded cliffs. Summer. 



5. ASPLENIUM ANGUSTIFOLIUM Michx. M. p. 12. Rich woods. Autumn. 



Philadelphia — Manayunk (Gi.). Lancaster — Peach Bottom. Berks — 

 Reading (P.). 



6. ASPLENIUM RuTA-MURARiA L. M. p. 12. Limestone cliffs. Summer. 



Bucls — Riegelsville (Fr.). Montgomery — Conshohocken (C. E. S.). 

 Chester— Brook's Mill (Fl. C). Lancaster— Millersville (Cr.). Lehigh 

 — Helfrich's Springs (Kr.). Northampton— Haston, Porter (B. C). 



7. ASPLENIUM MONTANUM Willd. M. p. 12. Rocks. Summer. 



Chester — Octoraro Creek (Le.) (St.). Lancaster — York Furnace, Tuc- 

 quan (Ca.) (Sa.), Fites Eddy (St.). Le/w'^ft— Idlewild (Kr.). North- 

 ampton — Easton (P.). 



8. ASPLENIUM Bradleyi D. C. Eaton. M. p. 12. Rocks. Summer. 



Lancaster— Tucquan, near Muddy Run (Br.). 



9. ASPLENIUM ACROSTICHOIDES Sw. M. p. 12. Rich woods. Summer. 



10. ASPLENIUM EiLix-FOEMiNA (L.) Bernh. M. p. 12. In woods, thickets 



and along fences. Summer. 



8. CAMPTOSORUS Link. 

 1. Camptosorus rhizophyllus (L.) Link. Walhing Fern. M. p. 13. 

 Shaded rocks. Summer. 

 Philadelphia,— 'Bj'berry, Mart. (B. C), above Manayunk (He.), Wissa- 



