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A Key to the Pteridophytes of Moorea GROUP 1: Sporangia borne in leaf axils or on top of leaves |
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| 1 | Plants composed nearly exclusively of green stems; leaves highly reduced, 1-2 mm, veins absent | 2 |
| Plants composed of both stems and leaves; leaves not greatly reduced compared to stems, each supplied by single vein | 3 | |
| 2 | Stems flat | Psilotum complanatum |
| Stems round | Psilotum nudum | |
| 3 | Leaf arrangement dorsiventral | 4 |
| Leaf arrangement radial | 5 | |
| 4 | Plants usually terrestrial; primary stems stout, erect (in large plants); sporophylls not dimorphic | Selaginella banksii |
| Plants usually on rocks near streams; primary stems thin, creeping; sporophylls dimorphic (sporophylls of one side more strongly ascending than other) | Selaginella laxa | |
| 5 | Plants epiphytic exclusively on tree ferns; sporangia fused into trilocular synangia that are borne on adaxial side of leaves near leaf bases | Tmesipteris gracilis |
| Plants terrestrial or epiphytic (but not limited to growing only on tree ferns); sporangia not fused into synangia, borne singly in the axils of leaves | 6 | |
| 6 | Plants terrestrial; stems monopodially branched | Lycopodiella cernua |
| Plants epiphytic; stems dichotomously branched | 7 | |
| 7 | Sporophylls similar to sterile leaves; strobili absent | Huperzia squarrosa |
| Sporophylls much smaller than sterile leaves; sporangia borne in distinct strobili | 8 | |
| 8 | Strobili branched 2–3 times; leaves deltate | Huperzia phlegmaria |
| Strobili branched only once if at all; leaves oblong to ovate | Huperzia ribourtii | |
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