10 FLOSA OF PHILADELPHIA. 



3. PTEBIDIUM Scop. Brake or Bracken. 

 1. Pteridium aquilinum (L.) Kuhn. Common Brake. M.. p. 8. Thickets 

 and hillsides. Summer. 



4. PELLAEA Link. 

 1. Pellaea atropurpurea (Li.) Link. Cliff Brake. M. p. 9. Rocks, pre- 

 ferring limestone. Summer. 

 Philadelphia— Shawmont (Sa.). Bucks— Nockamixori. Montgomery— 

 Lafayette, Ivy Bock, Conshohocken (Be.). Chester— Phoenixville (Sa.). 

 Lancaster— (P.). Berks— Beading (Wn.). Lehigh— Rockdale (Kr.). 

 Northampton— Gaston, Porter (B. C). Dauphin— Harrisburg : (Wn.). 



5. CHEILANTHES Sw. 

 1. Cheilanthes lanosa (Michx;) "Watt. Lip Fern. M. p. 9. Bocks. 

 Summer. 

 Bucks— Pipers ville, Sellersville (Ft.), Zieglersville (Je.), Nockamixon 

 (Le.), Neshaminy (Re.) (Ws.). Montgomery — Valley Forge, I. Burk 

 (He.), Mill Creek (C. E. S.), Lafayette (Te.). Delaware— West of Hol- 

 land's Bridge, Dr. Geo. Smith (Pu.). Chester— Phoenixville (Sa.), Green- 

 tree (Te.). Lancaster— Octoraro Creek, near Maryland line (Pr.), Safe 

 Harbor, Tucquan (Br.). , Berks— Reading (P.). Northampton— Eas- 

 ton (P.). 



.ffttntenZon^Lambertville, Milford (C). 



New Castle— Below Jessups, opposite Rockford. 



6. WOODWAEDIA J. E. Smith. Chain Pern. 



Leaves uniform; veins free between the sori and, the margin. 



1. W. Virginica. 

 Leaves of two kinds; veins everywhere anastomosing. 2. W. areolata. 



1. Woodwardia Virginica (L.) J. P. Smith. M. p. 10. Swamps. Summer. 



Bucks — Tullytown (Cr.) (Wn.), Bristol (Pr.). Delaware — Tinicum. 

 Northampton— Moore Twp. (P.). Burlington — Taunton (Sts.), Pember- 

 ton (Te.). Camden— Winslow, Mart. (B. C). Gloucester — Paulsboro 

 (Ja.), Mickleton (He.), Woodbury (Je.), Swedesboro, Eepaupo (Li.). 

 Cape May— Sea Isle Junction (Sa.). Atlantic— Egg Harbor (Le.) (TJ. 

 C S.), May's Landing (Te.). Monmouth— Ocean Beach, between Deal 

 and Elberon (C.), Asbury Park (Te.). Mercer — Trenton (C). 



New Castle— Cedar Swamp, Collins. 



2. Woodwardia areolata (L.) Moore. M. p. 10. Swamps and wet woods. 



Summer. 

 Bucks— Tullytown (Cr.) (Wn.). Delaware— Tinicum. 

 New Jersey — Common. 

 New Castle — Not rare. 



7. ASPLENITJM L. Spleenwort. 



Sori straight or rarely slightly curved, attached to the upper side of a vein, 

 small (except 5). 

 Leaves pinnatifid or pinnate below, tapering to a point. 



Stipes blackish below; lobes rounded or the lowest acuminate. 



1. A. pinnatifidum. 



