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A Key to the Pteridophytes of Moorea GROUP 3: Epiphytic with simple leaves |
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| 1 | Petioles and blades thick, fleshy; fertile leaves divided into a blade-like portion without spores (i.e., trophophore) and a spike-like portion bearing spores (i.e., sporophore) that is borne adaxially on trophophore | Ophioglossum pendulum |
| Petioles and blades not fleshy; fertile leaves not divided into trophophore and sporophore | 2 | |
| 2 | Sporangia spread over laminar surface (i.e., acrostichoid) | 3 |
| Sporangia clustered into discrete sori | 6 | |
| 3 | Sporangia restricted to leaf tip; fertile section greatly narrowed | Belvisia spicata |
| Sporangia cover whole surface of fertile leaves; fertile leaves same size as sterile, or slightly smaller | 4 | |
| 4 | Leaves to ca. 70 cm long; sterile blades glabrous or with sparse, inconspicuous scales | Elaphoglossum savaiense |
| Leaves to ca. 25 cm long; sterile blades bearing scattered, acicular scales | 5 | |
| 5 | Stipe scales subulate, erect, with margins entire or subentire | Elaphoglossum samoense |
| Stipe scales flat, spreading, with margins serrulate throughout | Elaphoglossum florencei | |
| 6 | Sori clearly linear or elongate | 7 |
| Sori round (sometimes fusing to appear irregularly elongate in Selliguea plantaginea) | 11 | |
| 7 | Veins clearly anastomosing | 8 |
| Veins free (may be difficult to see in Haplopteris elongata) | 9 | |
| 8 | Leaves sessile to shortly stalked; blade apices often variously incised | Antrophyum reticulatum |
| Leaves clearly stalked, without wing; blade apices acute or acuminate | Antrophyum plantagineum | |
| 9 | Blades less than ca. 1 cm wide, narrowly linear; sori in two submarginal rows | Haplopteris elongata |
| Blades to ca. 15 cm wide, apex obtuse, gradually tapering to base; sori linear along veins, ca. 60° to midrib | 10 | |
| 10 | Midribs rounded on abaxial side near blade bases | Asplenium nidus |
| Midribs sharply angular on abaxial side near blade bases | Asplenium australasicum | |
| 11 | Indusia present, round | Oleandra sibbaldii |
| Indusia absent | 12 | |
| 12 | Rhizomes erect; leaf trace only a single vascular bundle; spores green | 13 |
| Rhizomes creeping; leaf trace comprising multiple vascular bundles; spores yellow | 15 | |
| 13 | Blades with black margins; laminar hairs absent | Grammitis marginelloides |
| Blade margins not black; laminar hairs present | 14 | |
| 14 | Blades ca. 6-8 x 0.5-1.0 cm; multiple irregular rows of sori between midvein and blade margin; sori each ca. 0.7-1.0 mm diam. | Archigrammitis tahitensis |
| Blades ca. 3-6 x 0.4–0.5 cm; single row of sori on each side of midvein; sori each ca. 1.5–1.7 mm diam. | Oreogrammitis raiateensis | |
| 15 | Adaxial blade surface densely covered in tan stellate scales | Pyrrosia serpens |
| Blades glabrous | Selliguea plantaginea | |
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