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A Key to the Pteridophytes of Moorea GROUP 4: Epiphytic with leaves pinnatifid or more dissected |
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| 1 | Fertile and sterile leaves strongly dimorphic; fertile leaves much narrower than sterile | 2 |
| Fertile and sterile leaves monomorphic; fertile leaves same width as sterile or only slightly narrower | 5 | |
| 2 | Young leaves reddish; pinnae not articulate to rachis; rhizomes erect | 3 |
| Young leaves green; pinnae articulate to rachis; rhizomes long-creeping | 4 | |
| 3 | Stipe base and rhizome scales ca. 3 mm wide, papery, light brown | Blechnum patersonii |
| Stipe base and rhizome scales < 1 mm wide, narrow, reddish | Blechnum vulcanicum | |
| 4 | Veins free | Lomariopsis brackenridgei |
| Veins anastomosing | Lomagramma tahitensis | |
| 5 | Blades pinnatifid or pinnatisect | 6 |
| Blades 1-pinnate or more divided | 11 | |
| 6 | Rhizomes long-creeping; leaves arranged dorsally in two rows | Microsorum powellii |
| Rhizomes short-creeping or erect; leaves clustered | 7 | |
| 7 | Blades pinnatifid; blade segments obovate, ca. 2 x 1 mm; sorus one per segment, protected by blade segment folded along midvein around sorus | Calymmodon cf. orientalis |
| Blades pectinate; blade segments linear, at least 5 x 2 mm; multiple sori per segment, not protected by folded segment lobes | 8 | |
| 8 | Rhizome scales uniformly brown, not clathrate; sori covering at least half of laminar surface on fertile pinnae, superficial | 9 |
| Rhizome scales clathrate; sori borne only near apex of fertile pinnae, partially sunken in lamina | 10 | |
| 9 | Stipes and rachises with reddish hairs dense proximally, diminishing distally | Dasygrammitis cf. purpurascens |
| Stipes and rachises lacking reddish hairs | Ctenopterella blechnoides | |
| 10 | Sori borne on tips of elongated, thickened lobes protruding ca. 1.5 mm from pinna margins, 2 or 3 per pinnule | Prosaptia contigua |
| Sori borne on lower lamina surface, near margins but not on protruding lobes | Prosaptia cf. subnuda | |
| 11 | Rhizomes erect | 12 |
| Rhizomes long-creeping | 18 | |
| 12 | Sori round, borne on underside of false indusia | 13 |
| Sori elongate or linear, borne on underside of blades, not on false indusia | 14 | |
| 13 | Ultimate segments fan-shaped | Adiantum raddianum |
| Ultimate segments trapeziform | Adiantum hispidulum | |
| 14 | Sori linear, submarginal, protected by reflexed laminar margins (i.e., false indusium) | 15 |
| Sori elongate or linear, along veins on laminar surface, protected by true indusia | 16 | |
| 15 | Blades pedate | Doryopteris concolor |
| Blades 1-pinnate-pinnatifid; pinnules lobate | Cheilanthes cf. nudiuscula | |
| 16 | Pinnae with basiscopic base cut away in a smooth curve (excavate) | Asplenium polyodon |
| Pinna bases same shape on both acroscopic and basiscopic sides | 17 | |
| 17 | Each leaf with 10-12 distinct pinna pairs below the tapered apex; stipes ca. 10 cm–15 cm long; blades to ca. 20 cm long | Deparia confluens |
| Each leaf with 12-15 distinct pinna pairs below the tapered apex; stipes ca. 25 cm–30 cm long; blades to ca. 35 cm long | Deparia petersenii ssp. congrua | |
| 18 | Blades 1-pinnate | 19 |
| Blades at least 2-pinnate | 21 | |
| 19 | Basalmost pinnae lobed to pinnatifid on basiscopic side | Humata pectinata |
| Basalmost pinnae not lobed basiscopically | 20 | |
| 20 | Laminar margins crenate to lobed acroscopically; major pinna vein along basiscopic margin, with secondary veins only on acroscopic side | Lindsaea repens var. marquesensis |
| Laminar margins with single acroscopic lobe, otherwise entire; main pinna vein in middle of lamina, with secondary veins on both acroscopic and basiscopic sides | Arthropteris palisotii | |
| 21 | Pinnae linear; margins of ultimate segments (pinnules) crenate to lobed acroscopically | Lindsaea rigida |
| Pinnae deltate-lanceate; margins of ultimate segments entire or incised +/- equally on both acroscopic and basiscopic sides | 22 | |
| 22 | Leaves small, no longer than ca. 15 cm; indusia attached only at base | Humata anderssonii |
| Leaves large, greater than ca. 20 cm; indusia attached at the base and sides | 23 | |
| 23 | Rhizome scales tightly appressed, ovoid with acuminate tip, dark brown in center and light brown near margins | Davallia solida |
| Rhizome scales reflexed or patent, not ovoid, solid reddish brown | 24 | |
| 24 | Rhizome scales lanceate, sessile | Leucostegia pallida |
| Rhizome scales linear, much longer than wide, peltate | Wibelia denticulata |
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