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Lycophytes versus Monilophytes

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Lycophytes bear small, single-veined leaves called microphylls; monilophytes — ferns, horsetails, and whisk ferns, also called pterophytes — bear larger, branch-veined leaves called megaphylls.

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A club moss's tiny scale-like microphylls contrast with a fern frond's broad, multiply-veined megaphyll blade.

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A club moss is a lycophyte, unrelated closely to true mosses, despite the shared common name.