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"Pteridophyta" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure, which enables searching at various levels of specificity.

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An extremely diverse group of approximately 12,000 species of FERNS and so-called fern allies.

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This graph shows the total number of publications written about "Pteridophyta" by people in this website by year, and whether "Pteridophyta" was a major or minor topic of these publications.
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