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Key to Campyloneurum

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1 Main lateral veins clearly visible on the upper leaf surface; leaves 5-8 (-12) cm wide; sori in 6-15 rows on each side of the midvein
  2 Secondary areoles in proximal half of blades asymmetrical, or primary areoles with distal veinlet irregularly curved; sori usually in 3 rows between main lateral veins
  2 Secondary areoles in the proximal half of blades symmetrical; sori usually in 2 rows between main lateral veins
1 Main lateral veins obscure on the upper leaf surface; leaves 0.4-6 cm wide; sori in 1-6 (-10) rows on each side of the midvein.
    3 Sori in 4-8 rows on each side of the midvein; leaves 2.5-6 cm wide; petioles 4-15 cm long
    3 Sori in 1-3 (-4) rows on each side of the midvein; leaves 0.5-1.5 cm wide; petioles 0-2 (-5) cm long
      4 Secondary areoles as long as broad; rhizome scales 1-2.5 mm wide, with slightly differentiated marginal cells
      4 Secondary areoles two times longer than broad; rhizome scales 1-1.5 mm wide, without differentiated marginal cells