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Key to Acrostichum

Pteridaceae

Acrostichum

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(c) Bradley, Keith
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
(c) Cressler, Alan M.
1 Fertile leaves with sporangia borne on nearly all pinnae; costal areoles of the leaf broad, < 3× as long as wide