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A Key to the Pteridophytes of Moorea GROUP 2: Filmy Ferns |
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| 1 | Plants terrestrial; rhizomes erect | 2 |
| Plants rarely terrestrial, usually epiphytic or epipetric; rhizomes long-creeping | 4 | |
| 2 | Laminar tissue not expanded or only consisting of one to two rows of cells on each side of midrib | Abrodictyum asae-grayi |
| Laminar tissue normally expanded | 3 | |
| 3 | Long bristle-like, light reddish hairs present on stipes and rachises; blades light green, membranaceous | Callistopteris apiifolia |
| Such hairs absent; blades dark green, coriaceous | Abrodictyum dentatum | |
| 4 | Blades covered in fine white hairs, appearing glaucous | Hymenophyllum pallidum |
| Blades not glaucous | 5 | |
| 5 | Rhizomes ca. 2 mm diam. | 6 |
| Rhizomes filiform, less than 1 mm diam. | 7 | |
| 6 | Plants epiphytic on tree ferns | Abrodictyum caudatum |
| Plants terrestrial or epipetric | Vandenboschia maxima | |
| 7 | Rhizomes covered with fine yellow hairs | Hymenophyllum flabellatum |
| Rhizomes either nearly glabrous or covered with reddish to black hairs | 8 | |
| 8 | Rhizomes nearly glabrous; involucres bivalved | 9 |
| Rhizomes covered with reddish to black hairs; involucres tubular or conical | 12 | |
| 9 | Marginal hairs present on blades | Hymenophyllum digitatum |
| Marginal hairs absent from blades | 10 | |
| 10 | Blade margins denticulate; involucres bent at ca. 45° to blades | Hymenophyllum aff. multifidum |
| Blade margins not denticulate; involucres in same plane as blades | 11 | |
| 11 | Blade margins undulating | Hymenophyllum cf. javanicum |
| Blade margins flat | Hymenophyllum polyanthos | |
| 12 | Leaves peltate, tightly appressed to substrate | Didymoglossum tahitense |
| Leaves not peltate, not appressed to substrate | 13 | |
| 13 | False veins absent | 14 |
| False veins present | 15 | |
| 14 | Blades flabellate to irregularly pinnatifid, less than ca. 3 cm long; new stipes proliferating irregularly from other stipe bases or blades | Crepidomanes minutum |
| Blades 2-pinnatifid or more divided, ovate-lanceolate, greater than ca. 3 cm; no such proliferations | Polyphlebium borbonicum | |
| 15 | False veins marginal | 16 |
| False veins submarginal | 17 | |
| 16 | Rhizome hairs black, dense; false veins consisting of double row of slightly elongated marginal cells | Crepidomanes humile |
| Rhizome hairs reddish brown, numerous but not dense; false veins consisting of single row of greatly elongated marginal cells (ca. 4-5 x longer than other laminar cells) | Polyphlebium endlicherianum | |
| 17 | Leaves 1 cm or less; submarginal false veins continuous | Crepidomanes kurzii |
| Leaves 3 cm or greater; submarginal false veins discontinuous | Crepidomanes bipunctatum | |
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