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Frond
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==Sporangia== Fern fronds often bear [[sporangia]], where the plant's spores are formed, usually on the underside (abaxial surface) of the pinnae, but sometimes marginally or scattered over the frond. The sporangia are typically clustered into a [[sorus]] (pl., sori). Associated with each sorus in many species is a membranous protective structure called an indusium, which is an outgrowth of the blade surface that may partly cover the sporangia. Some fern species feature [[frond dimorphism]], in which fertile and sterile fronds differ in appearance and structure.
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