Spruce Ovule
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“Longitudinal section through fertilized ovule of a spruce. p, pollen grains; t, pollen tubes; n neck of the archegonium; a, body of archegonium with nucleus; e, embryo sac filled with endosperm.” -Bergen, 1896
Source
Joseph Y. Bergen, A. M. Elements of Botany (Boston, MA: Ginn & Company, 1896)
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