342 



4. Frond 10 times as long as broad 

 Frond 20 times as long as broad 



5. Fronds lobed 



Fronds pinnatifid or once or more 



pinnate 



6. Fronds pinnatifid 



Fronds once or more pinnate ... 



7. Fronds once pinnate ... 

 Fronds bipinnate or tripinnate 



8. Pinnae entire ... 



Pinnae crenate, serrate, lobed or 

 pinnatifid ... 



9. Pinnae crenate or inciso-crenate 

 Pinnae serrate, lobed or pinnatifid 



10. Pionae dimidiate 

 Pinnae not dimidiate ... 



11. Pinnae i to I inch long 

 Pinnae 1 inch, long or more 



12. Sori 1 or rarely 2 in the teeth 

 Sori not in the teeth ... 



13. Pinnae f to 1^ inch long 



Pinnae 2 to 3^ inches long 



14. Pinnae 3 to 3^ inches long, crenulated 



the whole length ... 

 Pinnae 2 to 2^ inches long, crenulated 

 towards the tip 



15. Pinnae serrate ... 

 Pinnae lobed or pinnatifid 



16. Base of pinnae narrowed suddenly- 

 Base of pinnae cuneate ... 



17. Upper part of rachis with a narrow 



wing... 

 Rachis not winged 



18. Pinnae lobed 

 Pinnae pinnatifid 



19. Lower pinnae 3-5-lobed 

 Lower pinnae more than 5-lobed 



20. Lobes shorter on lower side of pinnae 



than on upper 

 Lobes on both sides of pinnae equal ... 



21. Rachis compressed ; sori marginal 

 Rachis not compressed ; sori not marginal 



22. Frond pinnate to the end 

 Frond with bare end ... 



23. Rachis villous ... 

 Rachis nearly naked 



24. Fronds tripinnate 

 Fronds bipinnate 



25. Fronds including stipes about 1 foot long 

 Fronds 1^ to 6 feet long 



26. Fronds tripinnatifid 

 Fronds not tripinnatifid 



