182 MORPHOLOGY OF THE ANGIOSPERMS 



nuclei are the gametes, that definite male cells are not usually formed. 

 Improved techniques have demonstrated that each nucleus is sur- 

 rounded by a definitely limited sheath of cytoplasm. The male gametes 

 are cells. 



BIBLIOGRAPHY 



Pollen and Male Gametophyte 



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Wiss. Bot., 10: 275-316, 1876. 

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: "Introduction to Embryology of Angiospenns," New York, 1950. 



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