Vol. XLIV 



THE 



S 



Gazette 



September 1907 



Editors: JOHN M. COULTER and CHARLES R. BAx^NES 



CONTKNTiS 



The Structure and Relationships of the Potamogetonaceae 



and Allied Families 



Mintin Asbury Chrysler 



The Male Gametophyte of Dacrydium 



Mary S. Young 



Bryological Papers* I. The Origin of Air Chambers 



Charles R Barnes and W. J. G. Land 



The Development of the Sporangium of Lygodium 



R. Binford 



Briefer Articles 



r^aires of North American Trees 



A Remarkable Case of Polyspermy in Ferns 



C. S Sargent 

 William L. Woodburn 



Current Literature 



News 



^«b 



The University of Cliica,2:o 



CHICAGO and NEW YORK 



William Wesley as4 Son, Irosdoa 





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