Abstract
1. The archesporial cell of Galinsoga ciliata cuts off no tapetal cells but develops directly into the megasporocyte. 2. Reduction division and the second meiotic division result in a linear tetrad. 3. The chalazal megaspore develops into an eight-nucleate, six-celled gametophyte, and the other megaspores disintegrate. 4. The large angular synergids originally extend almost as far up toward the chalazal end of the gametophyte as the small angular egg, and occupy almost all of the micropylar end of the sac. These gradually become rounded, reduced to a mere fraction of their original size, and are pushed to one side by the egg, which soon after its formation rounds up, enlarges, elongates, and occupies almost all of the micropylar end of the gametophyte. 5. The layer of nucellar cells surrounding the megasporocyte and tetrad disintegrates during the development of the megagametophyte. 6. There is an integumentary tapetum. 7. The two antipodals occasionally have as many as four nuclei each. 8. The pollen tub...
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