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Key to Athyriaceae

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1 Leaves 1-pinnate to 1-pinnate-pinnatifid (the pinnae entire or pinnatifid); sori elongate, 2.5-6× as long as wide, even the larger sori generally straight and not extending across the veins.
..2 Leaves 1-pinnate, the pinnae entire
..2 Leaves 1-pinnate-pinnatifid, the pinnae pinnatifid
1 Leaves 2-pinnate to 3-pinnate (the pinnae at least 1-pinnate); sori elongate, 2-3× as long as wide, the larger sori generally curved and extending across the veins (except Diplazium esculentum).
....3 Veins anastamosing
....3 Veins free, simple or forked.
......4 Rhizomes short-creeping to ascending; leaves variegated, silvery gray and gray-green; [alien, rarely persisting or naturalizing]
......4 Rhizomes erect; leaves not variegated, bright green; [native and widespread, sometimes cultivated]

Key to Athyrium

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1 Rhizomes short-creeping to ascending; leaves variegated, silvery gray and gray-green; [alien, rarely persisting or naturalizing]
1 Rhizomes erect; leaves not variegated, bright green; [native and widespread, sometimes cultivated].
..2 Leaf blade widest near middle (the fourth or fifth pair of pinnae from the base the largest); margins of indusium toothed or ciliate (not glandular); rachis glandular; spores yellow or brown, finely papillose; petiole scales persistent, up to 1 cm long and 1.5 mm wide
..2 Leaf blade widest near base (the second or third pair of pinnae from the base the largest); margins of indusium ciliate and glandular-ciliate; rachis eglandular; spores brown or dark brown, reticulate-wrinkled; petiole scales early deciduous, up to 5 mm long and 1 mm wide
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