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Polystichum
Key ex Copeland 1949, Philip. J. Sci. 77:392.
Species in Papuasia
| 1a. | Frond over half as broad as long | P. keysserianum |
| Frond over twice as long as broad | 2 | |
| 2a. | Pinnules and segments not strongly bullate | 3 |
| Pinnules and segments strongly bullate | 14 | |
| 3a. | Lamina at least 30 cm long | 4 |
| Lamina usually under 25 cm long | 12 | |
| 4a. | Freely tripinnate | P. bamleriana |
| Only lowest pinnules or non pinnate | 5 | |
| 5a. | Pinnules acute or aculeate | 6 |
| Pinnules rounded, hardly mucronate | 11 | |
|
6a. |
Segments of pinnae mostly connected | P. aculeatum |
| Pinnules mostly free | 7 | |
| 7a. | Free pinnules less than 15 pairs | 8 |
| Free pinnules c. 20 pairs | P. bolanicum | |
| 8a. | Sori costal to medial | 9 |
| Sori submarginal | P. brassii | |
| 9a. | Some pinnae over 15 cm long | P. aculeatum |
| Pinnae smaller | 10 | |
| 10a. | Pinnules weakly mucronate | P. aculeatum |
| Pinnules very mucronate | P. brassii | |
| 11a. | Pinnules crenate to entire | P. muticum |
| Pinnules incised to subpinnate | P. meyerdreesii | |
| 12a. | Stipes conspicuously stout | P. papuanum |
| Stipes slender | 13 | |
| 13a. | Pinnules acute | P. kinabaluense |
| Pinnules rounded | P. alpinum | |
| 14a. | Frond lanceolate | P. cheilanthoides |
| Frond linear | P. linearis |
P. pseudomicrophylum, P. takakii