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The extraordinary construction of ferns leads to distinctive names for their parts.
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The part we call a leaf on most plants is known as a frond on a fern.
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The stem that supports the frond is called a stipe.
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The parts we call leaflets on other plants are identified as pinna.
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The portion of the frond that contains the pinna is known as the blade.
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Newly unfurling frond is referred to as a crozier or fiddlehead.
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The swollen underground creeping stem from which the roots are born is a rhizome.