333 



8. Involucres marginal or sub- 



marginal ... 



Involucres not marginal or sub- 

 marginal 



9. Involucres cup-shaped 



Involucres not cup-shaped 



10. Involucres linear, continuous 

 Involucres oblong, not continuous 



11. Involucres opening outwards 

 Involucres opening inwards 



12. Involucres reaching nearly to the 



midrib 

 Involucres not reaching nearly to 

 the midrib 



13. Fronds deltoid; involucre narrow 

 Fronds not deltoid 



.14. Involucres more or less toothed 

 Involucres not toothed ... 



15. Involucres linear, parallel to midrib 

 Involucres linear or not, not parallel 



to midrib 



16. Sori midway between midrib and 



edge of frond ... 

 Sori close to midrib 



17. Sori quite close to midrib ; in 



volucres continuous ... 

 Sori near midrib ; involucres not 

 continuous 



18. Involucres linear, on veins 

 Involucres orbicular or reniform 



19. Involucres orbicular, peltate 

 Involucres reniform, attached by 



one side 



20. Fronds simple, entire 

 Fronds pinnate or compound 



21. Fronds pinnate, pinnae articulate 



on the rachis ... 

 Fronds pinnate or compound 

 pinnae not articulate 



22. Tree fern .., 

 Not tree fern 



23. Fronds pinnate 

 Fronds bi- or tripinnate 



24. Sori in linear masses 

 Sori not in linear masses 



25. Sori marginal 

 Sori not marginal . . . 



26. Fronds simple, entire 

 Fronds tri- or more-pinnatifid 



27. Sori parallel to midrib 

 Sori on veins, not parallel to midrib 



^8. Sori spread all over under surface 

 of fronds ,.. 



9, 



15. 



7. Davallia (p. 336). 



10. 



11. 



9. Adiantum (p. 338). 



8. Lindsaya (p. 337). 



"12. 



11. Onychium (p. 339). 



13. 



14. 

 13. Pteris (p. 339). 

 10. Cheilanthes (p. 338). 



12. Pellaea (p. 339). 



16. 



18. 



15. Lomaria (p. 341). 



17. 



16. Blechnum (p. 341). 



17. Woodwardia (p. 341). 



18. Asplenium (p. 341). 



19. 



19. Aspidium (p. 345). 



20. 

 22. Oleandra (p. 349). 

 21. 



21. Nephrolepis (p. 349). 



20. Nephrodium (p. 346). 



23. 

 24. 

 26. Brainea (p. 353). 

 Alsophila (p. 334). 

 25. 

 28. 

 26. 

 27. 



28. Vittaria (p. 354). 



24. Nothochlaena (p. 353). 



29. Drymofflossum(Tp.354:). 



25. Gynmopramme(T^.B53). 



31. Acrostichum (p. 354). 



