A Key to the Pteridophytes of Moorea

GROUP 6: Terrestrial with up to 1-pinnate-pinnatifid leaves

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 reticulatum
  Petioles and blades not fleshy; fertile leaves not divided into trophophore and sporophore 2
2 Blades fan-shaped, deeply cleft with dichotomous free veins Schizaea dichotoma
  Blades not as above 3
3 Blades simple to pinnatifid; stipes with phyllopodia, articulate to rhizomes 4
  Blades at least 1-pinnate; stipes lacking phyllopodia, not articulate to rhizomes 8
4 Leaves simple Microsorum punctatum
  Leaves pinnatifid 5
5 Sori in regular rows, each ca. 2-3 mm diam. 6
  Sori not in regular rows, each ca. 1-2 mm diam. 7
6 Leaves to ca. 2.5 m; sori deeply immersed, appearing as raised bumps on adaxial surfaces (blades embossed) Microsorum membranifolium
  Leaves no greater than 50 cm; sori not, or only shallowly immersed Microsorum grossum
7 Leaves rarely over 50 cm long; blade margins regular; sori superficial; rhizome scales round to oval Microsorum commutatum
  Leaves to over 1 m long; blade margins highly irregular; sori slightly sunken; rhizome scales ovate-lanceolate, tip attenuate Microsorum x maximum
8 Rhizomes long creeping; juvenile sterile leaves pinnate, mature sterile leaves 2-pinnate Teratophyllum wilkesianum
  Rhizomes short-creeping or erect; sterile leaves not dimorphic 9
9 Underside of leaves covered in white powder (i.e., farina) Pityrogramma calomelanos
  Underside of leaves lacking white powder 10
10 Midrib bearing many bulblets Diplazium proliferum
  Midrib lacking bulblets 11
11 Sporangia spread over laminar surface (i.e., acrostichoid) 12
  Sporangia clustered into discrete sori 13
12 Plants terrestrial in forest understory; fertile and sterile leaves dimorphic Bolbitis lonchophora
  Plants terrestrial in wet ground near coast; fertile and sterile leaves similarly sized Acrostichum aureum
13 Sori linear or elongate 14
  Sori round 18
14 Sori elongate along secondary veins (not costae); pinnae with basiscopic base cut away in a smooth curve (i.e., excavate); pinna margins lobed or deeply serrate 15
  Sori linear along whole length of costae; pinna bases same shape on both acroscopic and basiscopic sides; pinna margins entire or slightly serrate 16
15 Rachis green; pinnae trapeziforme; sori at 45° angle to costae Asplenium tenerum
  Rachis brown to black; pinnae linear or lanceolate; sori slightly oblique, nearly parallel to costae Asplenium caudatum
16 Fertile and sterile leaves monomorphic; leaves to ca. 2 m Blechnum orientale
  Fertile and sterile leaves hemidimorphic or dimorphic; leaves no greater than ca. 1 m 17
17 Pinnae adnate, gradually reducing in size near base; fertile and sterile leaves fully dimorphic Blechnum raiateense
  Pinnae stipitate, not reduced in size near base; fertile and sterile leaves hemidimorphic Blechnum pacificum
18 Rachises and stipes broadly alate to distal half of stipe; blades almost appearing pinnatifid Tectaria decurrens
  Rachises and stipes exalate; blades clearly at least 1-pinnate 19
19 Blade tips indeterminate, never completely unfurling; pinnae articulate to rachis 20
  Blade tips determinate; pinnae not articulate to rachis 23
20 Middle pinnae less than 3 cm long, round at apex Nephrolepis cordifolia
  Middle pinnae more than 5 cm long, obtuse or acute at apex 21
21 Pinnae margins crenate, pinna base not auriculate acroscopically Nephrolepis biserrata
  Pinnae margins entire or slightly crenate, pinna base auriculate acroscopically 22
22 Stipe base scales spreading, dull Nephrolepis exaltata
  Stipe base scales appressed, shining Nephrolepis hirsutula
23 Round or clavate, yellow to orange, sessile glands or glandular hairs present on underside of laminae (need hand-lens or better magnification to see) 24
  Such glands or glandular hairs absent 28
24 Glandular hairs concentrated along veins and costules 25
  Glands spread throughout laminar surfaces 26
25 Glands sulfur-yellow, spherical Amphineuron opulentum
  Glands light yellow or orange, pear-shaped Christella dentata
26 Leaves very large, to ca. 1 m long; narrow, flat, reddish scales up to 2 cm long densely covering base of stipes, less dense toward rachis, often breaking and leaving spine-like bases on stipes Chingia longissima
  Leaves not this large; such scales not present 27
27 Wide (to ca. 3 mm) papery scales present at stipe bases, diminishing in size and number distally; all veins completely free Coryphopteris sp.
  Such scales not present; at least basalmost pair of veins from costules of adjacent pinna lobes anastomosing Sphaerostephanos subpectinatus
28 Stipes bearing several prominent aerophores, each with a minute green rim at the base; lower laminar surfaces glabrous Pneumatopteris mesocarpa
  Aerophores absent or inconspicuous; hairs present on lower laminar surfaces, veins, and costules 29
29 Basalmost pinna pair usually reduced in size; several pairs of veins from costules of adjacent pinna-lobes uniting to form an excurrent vein to the sinus between the two lobes (or, only the basal pair uniting and the next 2 to 3 pairs coming to the sides of a long translucent sinus-membrane; see also P. mesocarpa, which is distinguished by glabrous lower laminar surfaces) Sphaerostephanos invisus
  Basal pinnae not reduced; all veins free 30
30 Leaves to ca. 1 m long; pinnae to ca. 25 x 4 cm; basal basiscopic lobes of middle and distal pinnae greatly reduced Plesioneuron attenuatum
  Leaves not exceeding ca. 60 cm; pinnae to ca. 8 x 2 cm; basal basiscopic lobes not reduced Plesioneuron sp.


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