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Sporangium (pl. sporangia)

A sporangium is a minute sac (spore case) in which fern spores develop and mature.  Sporangia may be located on the underside of a regular fern leaf or on a separate, special fertile leaf, depending on the species.
 

Figure A.  Sporangia on underside of leaf of
marginal woodfern.  (Dryopteris marginalis)

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