Biology 112 - PHYLUM PTERIDOPHYTA (Ferns)

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Last updated 12:41 AM on 4/29/26
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5 Terms

1
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Fern gametophyte (prothallus)

  • Haploid

  • Heart‑shaped, tiny, green

  • Hermaphroditic (has both antheridia + archegonia)

  • Male: antheridia on edges (small green circles)

  • Female: archegonia in center (larger dark circles)

<ul><li><p><strong>Haploid</strong></p></li><li><p><strong>Heart‑shaped</strong>, tiny, green</p></li><li><p><strong>Hermaphroditic </strong>(has both antheridia + archegonia)</p></li><li><p>Male: <strong>antheridia</strong> on edges (small green circles)</p></li><li><p>Female: <strong>archegonia</strong> in center (larger dark circles)</p></li></ul><p></p>
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Young sporophyte growing from gametophyte

  • Diploid

  • Sporophyte

  • Baby sporophyte emerges from archegonium

  • Has first root, leaf, and stem

<ul><li><p><strong>Diploid</strong></p></li><li><p><strong>Sporophyte</strong></p></li><li><p>Baby sporophyte emerges <strong>from archegonium</strong></p></li><li><p>Has first root, leaf, and stem</p></li></ul><p></p>
3
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Fern stem (cross section)

  • Diploid

  • Sporophyte

  • Shows vascular bundles

    • Xylem + phloem stain purple/blue/pink

  • Key ID: vascular tissue present (unlike mosses)

<ul><li><p><strong>Diploid</strong></p></li><li><p><strong>Sporophyte</strong></p></li><li><p>Shows <strong>vascular bundles</strong></p><ul><li><p>Xylem + phloem stain purple/blue/pink</p></li></ul></li></ul><ul><li><p>Key ID: vascular tissue present (unlike mosses)</p></li></ul><p></p>
4
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Sori (Clusters of Sporangia)

  • Diploid tissue (sporangium walls)

  • Inside: spore mother cells (diploid)

    • Undergo meiosis → haploid spores

  • Found on backside of fronds (fern leaf)

<ul><li><p><strong>Diploid tissue</strong> (sporangium walls)</p></li><li><p>Inside: <strong>spore mother cells </strong>(diploid)</p><ul><li><p>Undergo <strong>meiosis</strong> → haploid spores</p></li></ul></li><li><p>Found on backside of fronds (fern leaf)</p></li></ul><p></p>
5
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Fern plant (sporophyte)

  • Diploid

  • Sporophyte

  • The full fern with fronds, stems, roots

  • Dominant, long‑lived generation

  • Has true vascular tissue

<ul><li><p><strong>Diploid </strong></p></li><li><p><strong>Sporophyte</strong></p></li><li><p>The full fern with fronds, stems, roots</p></li><li><p>Dominant, long‑lived generation</p></li><li><p>Has<strong> true vascular tissue</strong></p></li></ul><p></p>