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Examples
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The gametophyte or prothallial generation is thus extremely reduced, consisting of but little more than the male and female sexual cells -- the two sperm-cells in the pollen-tube and the egg-cell (with the synergidae) in the embryo-sac.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 Various
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In very few cases has anything representing prothallial development been observed; generally a small cell (the antheridial or generative cell) is cut off, leaving a larger tube-cell.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 Various
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