Development of the Embryo Sac of Lilium Henryi

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Abstract
As a result of meiosis in the macrospore mother cell, a 4-nucleate embryo sac is formed. Of these nuclei 3 migrate to the chalazal end of the embryo sac, leaving 1 at the micropylar end. In the next division the chromosomes of the 3 chalazal nuclei come onto a common spindle so that there are 36 chromosomes on this spindle and 12 on the micropylar spindle. After the 3rd division a 4-nucleate embryo sac is again formed having two n nuclei and two 3n nuclei. By 1 further division of the nuclei followed by cell plate formation, a typical 7-celled, 8-nucleate embryo sac is formed. Thus the egg is removed from the macro-spore mother cell by 4 nuclear divisions instead of 3. L. speciosum, L. philadephicum, and L. longiflorurn var. eximium (L. harrisii) revealed the same method of embryo sac formation.

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