528 Black.— The Morphology of Riccia Frostii , Aust. 
10. The number of chromosomes is eight for the gametophyte, and 
sixteen for the sporophyte. 
it. An abnormal sporophyte was observed, caused by bacterial invasion. 
The writer wishes to express her heartiest appreciation to Dr. David M. 
Mottier, at whose suggestion this study was carried on, for his assistance 
and kindly advice throughout its progress. 
Indiana University, 
Bloomington, Indiana. 
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