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Prothallus (prothallium) of the fern Polypodium vulgare seen under a light microscope.
Prothallus (prothallium) of the fern Polypodium vulgare seen under a light microscope.
Prothallus of the tree fern Dicksonia antarctica (note new moss plants for scale)
Prothallus of the tree fern Dicksonia antarctica (note new moss plants for scale)
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Pine gametophyte (outside) surrounding the embryo (inside)
Pine gametophyte (outside) surrounding the embryo (inside)