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MINNESOTA BOTANICAL STUDIES. 



10. Young antheridium showing stalk cell cut off and first division 

 of antheridium, x 300. 



n. Young antheridium in four-celled stage, x 300. 



12. Young antheridium in sixteen-celled stage, with young leaflets, 

 X 300. 



13. Young antheridium with shields, X 300. 



