Sori on the undersurface of a fern frond.

Sori on the undersurface of a fern frond.

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Caption: Underside of a fertile polypody fern frond, Polypodium vulgare, showing a clustering of sori, reproductive structures that contain the spores.

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Keywords: botany, fern, ferns, nature, plant, polypodium vulgare, polypody, polypody fern, pteridophyte, pteridophytes, reproductive structure, sorum, sporum

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