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Information about Australia's flora - Ferns of Australia and PNG
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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