Abstract

1. The archesporial cell serves as the megaspore mother cell. 2. From the megaspore mother cell by two divisions a row of four megaspores is formed. 3. The chalazal megaspore is the functional one; the other three disintegrate, beginning with the one next to the functional megaspore. 4. Development of the megagametophyte follows the typical course; three nuclear divisions result in the formation of eight nuclei, of which two function as polar nuclei, the others becoming the nuclei respectively of the egg, two synergids, and three antipodal cells.

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