POLYPODIACEAE. 9 



Burlington— Brown Mills, Medford (Br.), Moorestown (O), Atsion 

 (Sa.), New Lisbon (Te.). Camden— "East Magnolia, Clementon (Br.), 

 White Horse (C). Gloucester— Tomlin (Wn.). Mercer— Highstown, 

 Trenton (C). Monmouth— Matawan, Shark Biver (C). 



Family 4. POLYPODIACEAE R.Br. 



Leaves all flat, or their edges only slightly revolute.. 

 Sori without indusia. 



Stipes articulated to the rootstoeks; leaves pinnatifid. 



1. Polypodium. 

 Stipes not articulated to the rootstoeks; leaves 2-3 pinnatifid. 



11. Phegopteris. 

 Sori with marginal indusia formed of the more or less altered edge of 

 the leaf. 

 Sporanges at the ends of Veins, borne on a reflexed portion of the 



leaf. 2. Adiantwm. 



Sporanges borne on a continuous vein-like , receptacle which con- 

 nects the apices of the veins. 3. Pteridium. 

 Sporanges at or near the ends of unconnected veins. 



Sori mostly forming a continuous indusium around the seg- 

 ment. 4. Pellaea. 

 Sori minute ; indusium usually interrupted, if continuous the 

 segments small and bead-like. 5. Cheilanthes. 

 Sori dorsal or marginal, provided with special indusia. ""' 



Sori linear or oblong; indusia more than twice as long as broad. 

 Sori in chain-like rows: parallel to the midribs or rachises. 



6. Woodwardia. 

 Sori all oblique to the midrib or rachises; veins free. 



7. Asplenium. 

 Sori partly parallel to the midrib, partly oblique ; veins united. 



8. Camptosorus. 

 Sori roundish, indusia less than twice as long as broad. 



Indusium superior. , 



Indusium orbicular, peltate, fixed by the centre. 



, i 9. PolysticTmm. 



Indusium reniform or orbicular with a narrow sinus by 

 which it is attached to the leaf. 10. Dryopteris. 



Indusium delicate, partly inferior, fixed by a broad base and 



enclosing the sorus like a hood: 12. Filix. 



Indusium wholly inferior. . , 



Indusium roundish or stellate. 13. Woodsia. 



Indusium cup-shaped or somewhat 2-valved. 



14. Vennsiaedtia. 

 Spore-bearing leaves closely rolled together with necklace-like segments. 

 Leaves with free veins; rootstock stout, erect. 15. Matteuccia. 



Leaves with anastomosing veins; rootstoeks creeping with scattered 

 leaves. 16. Onoclea. 



1. POLYPODIUM L. 



1. Polypodium vtjlgare L. Polypody. M. p. 7. Rocks. Summer. 

 Common within the range except South New Jersey. 

 Burlington — Vincentown (C). . Camden — Delaware below Gloucester 

 (C)- 



2. ADIANTUM L. 

 1. Adiantum pedatum L. Maidenhair. M. p. 8. Woods. Summer. 



