POLYPODIACEAE. 9 



Burlington — Brown Mills, Medford (Br,), Moorestown (C), Atsion 

 (Sa.), New Lisbon (Te.). Car?j<?e?i— East Magnolia, Clementon (Br.), 

 White Horse (C.)- Gloucester— Tomlin (Wn,). Merce?-— Highstown, 

 Trenton (€.)■ Monmouth — Matawan, Shark Eiver (C.)- 



Family 4. POLYPODIACEAE R. Br. 



Leaves all flat, or their edges only slightly revolute. 

 Sori without indusia. 



Stipes articulated to the rootstocks; leaves pinnatifld. 



1. Polypodium. 

 Stipes not articulated to the rootstocks; leaves 2-3 pinnatifld. 



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. Adiantum. 



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

 nects the apices of the veins. 3. Pteridmm. 

 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. CheilantJies. 

 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, flxed by the centre. 



9. Polystichum. 

 Indusium reniform or orbicular with a narrow sinus by 



which it is attached to the leaf. 10. Dri/opteris. 



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. Dennstaedtia. 

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

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



Leaves with anastomosing veins ; rootstocks creeping with scattered 

 leaves. 16. Onoclea. 



1. POLYPODIUM L. 



1. Polypodium vulgare L. Polypody. M. p. 7. Eocks. Summer. 

 Common within the range except South New Jersey. 

 Burlington— Yincentov^n (C). Ca??!fZe/i— Delaware below Gloucester 

 (C). 



2. ADIANTUM L, 

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



