| After discounting doubtful data, C-values for 62 pteridophyte species remained acceptable for analysis. |
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| All pteridophyte roots are referred to as adventitious, in the sense that they arise at points along the stem. |
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| Lower vascular plant, formerly pteridophyte, also called vascular cryptogam, any of the spore-bearing vascular plants, including the ferns, club mosses, spike mosses, quillworts, horsetails, and whisk ferns. |
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| Descriptions of the histological patterns seen in sections of the pteridophyte shoot apex allowed closer comparisons with the zonate meristems of gymnosperms and angiosperms. |
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| In the Pteridophyte Phylogeny Group classification the Polypodiopsida consist of four subclasses, 11 orders, 48 families, 319 genera, and an estimated 10,578 species. |
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