A Key to the Pteridophytes of Moorea

GROUP 1: Sporangia borne in leaf axils or on top of leaves

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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