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Orthiopteris
Key ex Copeland 1949, Philip, J. Sci. 78:8
Species in Papuasia
| 1a. | Pinnules toothed with undissected middle area | 2 |
| Dissection complete, leaving no middle area | 4 | |
| 2a. | Undissected area over 3 mm wide | 3 |
| Undissected area c.2 mm wide | O. caudata | |
| 3a. | Indusia narrowly cuneate at the base | O. campylura |
| Indusia broadly cuneate at the bae | O. acuminate | |
| 4a. | Segments and winged axes over 0.5 mm wide | O cicutarioides |
| Segments and winged axes under 0.4 mm wide | O. trichophylla |