Dodatak:Popis papratnjača, O

Oc

, Ochlogramma , Ochropteris

Od

, Odontoloma , Odontosoria

Oe

, Oenotrichia , Oeosporangium , Oetosis

Ol

, Oleandra , Oleandraceae , Oleandropsis

Olfersia Raddi

1. Olfersia cervina (L.) Kunze
2. Olfersia subdiaphana (Hook. & Grev.) T. Moore

status nepoznat:

1. Olfersia acrocarpa C.Presl
2. Olfersia aemula C.Presl
3. Olfersia alata C. Sánchez & García Caluff
4. Olfersia angustata C.Presl
5. Olfersia apoda C.Presl
6. Olfersia auricoma C.Presl
7. Olfersia bifurcata C.Presl
8. Olfersia blumeana C.Presl
9. Olfersia conformis C.Presl
10. Olfersia crinita C.Presl
11. Olfersia cuspidata C.Presl
12. Olfersia decorata C.Presl
13. Olfersia decurrens C.Presl
14. Olfersia dimorpha C.Presl
15. Olfersia dissimilis C.Presl
16. Olfersia flabellata C.Presl
17. Olfersia foeniculacea C.Presl
18. Olfersia glabrescens C.Presl
19. Olfersia gorgonea C.Presl
20. Olfersia gracilis Blume
21. Olfersia horridula C.Presl
22. Olfersia hybrida C.Presl
23. Olfersia integrifolia C.Presl
24. Olfersia kaulfussiana C.Presl
25. Olfersia kunzeana C.Presl
26. Olfersia lanceolata Klotzsch
27. Olfersia langsdorffii C.Presl
28. Olfersia laurifolia C.Presl
29. Olfersia lepidota C.Presl
30. Olfersia lomarioides C.Presl
31. Olfersia macrophylla Klotzsch
32. Olfersia marginata C.Presl
33. Olfersia muscosa C.Presl
34. Olfersia neriifolia C.Presl
35. Olfersia nervosa T.Moore
36. Olfersia obducta C.Presl
37. Olfersia obtusa T.Moore
38. Olfersia pachyphylla C.Presl
39. Olfersia paleacea C.Presl
40. Olfersia peltata C.Presl
41. Olfersia petiolosa C.Presl
42. Olfersia pilosa C.Presl
43. Olfersia piloselloides C.Presl
44. Olfersia richardii T.Moore
45. Olfersia salicifolia C.Presl
46. Olfersia scolopendrifolia C.Presl
47. Olfersia sellowiana C.Presl
48. Olfersia sieberi C.Presl
49. Olfersia simplex C.Presl
50. Olfersia sorbifolia C.Presl
51. Olfersia spatulata C.Presl
52. Olfersia speciosa Klotzsch ex E. Fourn.
53. Olfersia sphenophylla C.Presl
54. Olfersia splendens C.Presl
55. Olfersia squamata C.Presl
56. Olfersia stricta C.Presl
57. Olfersia succisifolia C.Presl
58. Olfersia tecta C.Presl
59. Olfersia tomentosa C.Presl
60. Olfersia tripartita C.Presl
61. Olfersia triquetra C.Presl
62. Olfersia undulata C.Presl
63. Olfersia variabilis C.Presl
64. Olfersia vestita C.Presl
65. Olfersia vieillardii Carruth.
66. Olfersia villosa C.Presl
67. Olfersia viscosa C.Presl

Pteridophyta → Polypodiopsida → Polypodiales → Dryopteridaceae , Oligocampia

On

, Onoclea , Onocleaceae , Onocleopsis , Onychium

Oo

, Oochlamys

Op

, Ophioderma , Ophioglossaceae , Ophioglossum , Ophiopteris

Or

, Oreogrammitis , Oreopteris , Ormoloma

Ornithopteris J. Sm., 1875.; nije priznato

1. Ornithopteris wrightii (Baker) Millsp.

Pteridophyta → Polypodiopsida → Schizaeales , Orthiopteris , Orthogramma

Os

, Osmolindsaea , Osmunda , Osmundaceae , Osmundastrum , Osmundopteris

Ox

, Oxygonium