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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. |
