Abstract

1. The ovule of Ulmus fulva is anatropous, consisting of two integuments and a massive nucellus which becomes beaklike at maturity. 2. The archesporial cell functions as a macrospore mother cell. 3. The macrospore mother cell nucleus undergoes meiosis, forming four macrospore nuclei in a linear row. 4. No cell plates or walls are formed between the macrospore nuclei. 5. A typical eight-nucleate macrogametophyte is formed as a result of one further nuclear division. 6. The zygote, by transverse divisions, forms a row of three cells. The apical cell of this row develops into the embryo. The two basal cells form the suspensor.

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