oo 
nog d nvolucres 
333 
sub- 
marginal or 
ma 
rgina 
aire not marginal or sub- 
na 
à Eitvohiores cup-shaped 
Involucres not cu 
Involucres linear, continuous 
11. Involueres opening outwa 
Involueres opening iH. 
12. Involucres reaching nearly to the 
midri 
ae dp; not reaching nearly to to 
midrib 
13. E ronds deltoid ; involuere narrow 
Fronds not deltoid 
14. Involueres more or less toothed 
Involucres not toothed 
15. Involucres linear, parallel to midrib 
Involueres linear or not, not parallel 
to midrib 
16. Sori midway between midrib and 
edge of frond .. 
Sori close to midrib ra 
17, Sori quite close to midrib ; in- 
volucres continuo 
Sori near midrib ; involucres it 
ho 
- 
tinuous 
Involucres linear, on veins 
Involucres orbiéulas or inor 
Involucres orbicular, peltate - 
nvolucres Mox. attached by 
one si 
. Fronds sedi, entire 
Fronds pinnate or com 
und 
. Fronds pinnate, a amd irticdlate 
pinnate or compound, 
pinnae not articulate... 
22. Tree fern a 
Not tree fern ant s e 
23. Fronds pin i «d 
Fronds gs or a : ne 
28, 
. Sori in linear masses 
Sori not in linear masses ... 
Sori marginal  ... 
Sori not ma MEM e € Ws 
eee eee 
. Fronds simple, en 
ronds tri- or more pimatifd 
. Sori parallel to mi 
Sori on veins, not san to midrib 
Sori ea all over under surface 
of fronds 
eo eo 
15. 
Davallia (p. 336). 
10. 
11. 
Adiantum (p. 338). 
Lindsaya (p. 331). 
12. 
11. Onychium (p. 339). 
13. 
13. Pteris (p. 3 39); 
10. Cheilanthes (p. 338). 
12. Pellaea (p. 339). 
16. 
18, 
bo 
e 
28. 
15. Lomaria (p. 341). 
Ih 
Blechnum (p. 341). 
Woodwardia ( P Fat 
Asplenium (p. 341). 
19. 
Aspidium (p. 345). 
20. 
2. Oleandra (p. 349). 
21. 
21. Nephrolepis (p. 349). 
Jephrodium (p. 346). 
23. 
24. 
. Brainea (p. 3 
53). 
eee (p. 334), 
on 
26. 
27. 
Vittaria (p. 354). 
24. Nothochlaena (p. 353). 
29. Drymoglossum(p.354). 
25. 
Gynmogramme(p.353). 
31, Acrostichum (p. 354). 
