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The fertilizing cell, its varying form and behavior by Nelly Peery, 1890

The fertilizing cell, its varying form and behavior by Nelly Peery, 1890, Page 39

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37. A partition is formed, separating the oosphere from the rest of the branch: the protoplasm contracts into a dense rounded mass at the center - the oosphere - while a transparent protoplasm gathers above this, where the oogonium opens. The spermatozoide, having escaped by the bursting of the wall of the antheridium, now find their way into the opening of the archegonium, mingle
 
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