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Key to Acrostichum

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Show caption*© Keith Bradley 1 Fertile leaves with sporangia borne only on uppermost 5 or fewer pairs of pinnae; costal areoles of the leaf narrow, > 3× as long as wide  Acrostichum aureum

Show caption*© Alan Cressler: Acrostichum danaeifolium, Allapatchee Park, Alligator Creek, Punta Gorda, Charlotte County, Florida 2 by Alan Cressler 1 Fertile leaves with sporangia borne on nearly all pinnae; costal areoles of the leaf broad, < 3× as long as wide  Acrostichum danaeifolium