A Key to the Pteridophytes of Moorea

GROUP 4: Epiphytic with leaves pinnatifid or more dissected

1 Fertile and sterile leaves strongly dimorphic; fertile leaves much narrower than sterile 2
  Fertile and sterile leaves monomorphic; fertile leaves same width as sterile or only slightly narrower 5
2 Young leaves reddish; pinnae not articulate to rachis; rhizomes erect 3
  Young leaves green; pinnae articulate to rachis; rhizomes long-creeping 4
3 Stipe base and rhizome scales ca. 3 mm wide, papery, light brown Blechnum patersonii
  Stipe base and rhizome scales < 1 mm wide, narrow, reddish Blechnum vulcanicum
4 Veins free Lomariopsis brackenridgei
  Veins anastomosing Lomagramma tahitensis
5 Blades pinnatifid or pinnatisect 6
  Blades 1-pinnate or more divided 11
6 Rhizomes long-creeping; leaves arranged dorsally in two rows Microsorum powellii
  Rhizomes short-creeping or erect; leaves clustered 7
7 Blades pinnatifid; blade segments obovate, ca. 2 x 1 mm; sorus one per segment, protected by blade segment folded along midvein around sorus Calymmodon cf. orientalis
  Blades pectinate; blade segments linear, at least 5 x 2 mm; multiple sori per segment, not protected by folded segment lobes 8
8 Rhizome scales uniformly brown, not clathrate; sori covering at least half of laminar surface on fertile pinnae, superficial 9
  Rhizome scales clathrate; sori borne only near apex of fertile pinnae, partially sunken in lamina 10
9 Stipes and rachises with reddish hairs dense proximally, diminishing distally Dasygrammitis cf. purpurascens
  Stipes and rachises lacking reddish hairs Ctenopterella blechnoides
10 Sori borne on tips of elongated, thickened lobes protruding ca. 1.5 mm from pinna margins, 2 or 3 per pinnule Prosaptia contigua
  Sori borne on lower lamina surface, near margins but not on protruding lobes Prosaptia cf. subnuda
11 Rhizomes erect 12
  Rhizomes long-creeping 18
12 Sori round, borne on underside of false indusia 13
  Sori elongate or linear, borne on underside of blades, not on false indusia 14
13 Ultimate segments fan-shaped Adiantum raddianum
  Ultimate segments trapeziform Adiantum hispidulum
14 Sori linear, submarginal, protected by reflexed laminar margins (i.e., false indusium) 15
  Sori elongate or linear, along veins on laminar surface, protected by true indusia 16
15 Blades pedate Doryopteris concolor
  Blades 1-pinnate-pinnatifid; pinnules lobate Cheilanthes cf. nudiuscula
16 Pinnae with basiscopic base cut away in a smooth curve (excavate) Asplenium polyodon
  Pinna bases same shape on both acroscopic and basiscopic sides 17
17 Each leaf with 10-12 distinct pinna pairs below the tapered apex; stipes ca. 10 cm–15 cm long; blades to ca. 20 cm long Deparia confluens
  Each leaf with 12-15 distinct pinna pairs below the tapered apex; stipes ca. 25 cm–30 cm long; blades to ca. 35 cm long Deparia petersenii ssp. congrua
18 Blades 1-pinnate 19
  Blades at least 2-pinnate 21
19 Basalmost pinnae lobed to pinnatifid on basiscopic side Humata pectinata
  Basalmost pinnae not lobed basiscopically 20
20 Laminar margins crenate to lobed acroscopically; major pinna vein along basiscopic margin, with secondary veins only on acroscopic side Lindsaea repens var. marquesensis
  Laminar margins with single acroscopic lobe, otherwise entire; main pinna vein in middle of lamina, with secondary veins on both acroscopic and basiscopic sides Arthropteris palisotii
21 Pinnae linear; margins of ultimate segments (pinnules) crenate to lobed acroscopically Lindsaea rigida
  Pinnae deltate-lanceate; margins of ultimate segments entire or incised +/- equally on both acroscopic and basiscopic sides 22
22 Leaves small, no longer than ca. 15 cm; indusia attached only at base Humata anderssonii
  Leaves large, greater than ca. 20 cm; indusia attached at the base and sides 23
23 Rhizome scales tightly appressed, ovoid with acuminate tip, dark brown in center and light brown near margins Davallia solida
  Rhizome scales reflexed or patent, not ovoid, solid reddish brown 24
24 Rhizome scales lanceate, sessile Leucostegia pallida
  Rhizome scales linear, much longer than wide, peltate Wibelia denticulata


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