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A Key to the Pteridophytes of Moorea GROUP 7: Terrestrial with leaves 2-pinnate or more dissected |
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| 1 | Sori elongate or linear | 2 |
| Sori round | 10 | |
| 2 | Sori elongate along veins on lower leaf surface; true indusia present, linear; false indusia absent | 3 |
| Sori linear, submarginal; true indusia absent; false indusia formed by reflexed leaf margins | 6 | |
| 3 | Rachises and costae grooved adaxially with groove interrupted at junction of rachis and costa | Deparia petersenii ssp. congrua |
| Rachises and costae grooved adaxially with groove continuous at junction of rachis and costa | 4 | |
| 4 | Proximal pinnules pinnate | Diplazium grantii |
| Proximal pinnules entire to pinnatifid | 5 | |
| 5 | Pinnules deeply pinnatifid | Diplazium harpeodes |
| Pinnules entire or toothed | Diplazium ellipticum | |
| 6 | Stipule-like pinnules present at pinna bases; rhizomes long-creeping | Histiopteris incisa |
| Stipule-like pinnules absent; rhizomes short-creeping or erect | 7 | |
| 7 | Laminar tissue bicolored, green along pinna margins and white along costae | Pteris ensiformis cv. ‘Victoriae’ |
| Laminar tissue green throughout | 8 | |
| 8 | Veins free | Pteris mertensioides |
| Veins anastomosing | 9 | |
| 9 | Ultimate segments to 15 mm long; blades tripartite | Pteris tripartita |
| Larger ultimate segments over 30 mm long; blades 3-pinnate | Pteris comans | |
| 10 | Leaves with two large, fleshy stipules at base and pulvinae along stipe and rachis axes | 11 |
| Leaves lacking stipules and pulvinae | 12 | |
| 11 | Leaves often more than 3 m long; sporangia of each sorus contiguous but not fused | Angiopteris evecta |
| Leaves less than ca. 2 m long; sporangia laterally fused, forming synangia | Ptisana salicina | |
| 12 | Rhizomes erect, arborescent, covered in a dense layer of interwoven roots (i.e., root mantle; tree ferns) | 13 |
| Rhizomes without a tree-like growth habit | 15 | |
| 13 | Adaxial costal scales several cells wide, with dark marginal setae | Sphaeropteris medullaris |
| Adaxial costal scales a single row of cells lacking marginal setae | 14 | |
| 14 | Stipe scales concentrated only at growing tips of unfurling fronds, lacking apical setae | Cyathea epaleata |
| Stipe scales present at base of stipes and on rhizome, bearing apical setae | Alsophila tahitensis | |
| 15 | True indusia present (difficult to see in Dryopteris dicksonioides) | 16 |
| True indusia absent (false indusia formed by recurved leaf margins may be present) | 24 | |
| 16 | Indusium reniform | 17 |
| Indusium pocket-shaped (attached at base and sides) or scale-like (attached at base) | 20 | |
| 17 | Costae not grooved adaxially | Ctenitis sciaphila |
| Costae grooved adaxially | 18 | |
| 18 | Rhizomes creeping; pinnules aristate on margins | Arachniodes aristata |
| Rhizomes erect; pinnules not aristate on margins | 19 | |
| 19 | Stipe scales dense proximally, diminishing in number distally but present along entire length of stipe; indusia prominent | Dryopteris macrolepidota |
| Stipe scales present but not dense proximally, absent distally; indusia minute, not apparent without magnification | Dryopteris dicksonioides | |
| 20 | Rhizomes erect | 21 |
| Rhizomes long-creeping | 22 | |
| 21 | Leaf lamina light green abaxially, dark green adaxially; stipes and rachises black abaxially, green adaxially; rhizome scales clathrate | Asplenium gibberosum |
| Leaf lamina light green on both sides; stipes and rachises dark brown to stramineous on both sides; rhizome scales not clathrate | Sphenomeris chinensis | |
| 22 | Stipes articulate to phyllopodia which appear as swellings or stumps on the rhizomes; leaves arranged alternately in two rows on dorsal surface of rhizomes | Wibelia denticulata |
| Stipes not articulate to phyllopodia; leaves not arranged alternately in two rows | 23 | |
| 23 | Blades 2-pinnate-pinnatifid, or up to 3-pinnate proximally; sori round at vein endings | Microlepia scaberula |
| Blades 2-pinnate; sori linear, submarginal, supplied by multiple veins | Lindsaea rigida | |
| 24 | False indusia absent (sori completely exindusiate) | 25 |
| False indusia present (sori protected by recurved leaf margins) | 28 | |
| 25 | Basiscopic pinnules of proximal pinnae enlarged | 26 |
| Basiscopic and acroscopic pinnules of proximal pinnae +/- same size | 27 | |
| 26 | Veins free | Tectaria dissecta |
| Veins anastomosing | Tectaria tahitensis | |
| 27 | Stipe scales present from stipe base to proximal third of stipe, white | Macrothelypteris polypodioides |
| Stipe scales concentrated at stipe bases, reddish brown | Macrothelypteris torresiana | |
| 28 | Sori borne on inner surface of false indusia | 29 |
| Sori borne on leaf surface, not on false indusia | 30 | |
| 29 | Ultimate segments fan-shaped; pinnae to ca. 7 cm | Adiantum raddianum |
| Ultimate segments trapeziform; pinnae to ca. 20 cm | Adiantum trapeziforme | |
| 30 | Rhizomes no greater than 3 mm diam.; blades coriaceous; veins obscured | Paesia divaricatissima |
| Rhizomes 0.5 cm - 1 cm diam.; blades herbaceous; veins clearly visible | 31 | |
| 31 | Blade margins curved towards abaxial side; hairs on underside of lamina clear, acicular, abundant; indusial flaps mostly membranous, broad, sometimes bearing glandular hairs on upper surface | Hypolepis tenuifolia |
| Blade margins flat; hairs on underside of lamina brown, stout, few; indusial flaps mostly green, tapering, often bearing glandular hairs on margin | Hypolepis dicksonioides |
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