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Why is Adiantum (a pteridophyte) common...

Why is Adiantum (a pteridophyte) commonly called 'walking fern' and 'maiden hair fern' ?

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Adiantum propagates vegetatively by its leaf tips. Hence, it is commonly called as walking fern.
This plant has beautifully arranged black shining pertioles of its compound leaves. Hence, it is also called commonly as 'maiden hair fern' .
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