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XLbc Botanical 6a3ette 



a /Rontblfi journal jembracina all Departments of JBotanfcal Science 



Edited by John M. Coulter and Charles R. Barnes, with the assistance of other members of the 



botanical Staff of the University of Chicago. 



\ Vol. XLIV, No. 3 



Issued September 



CONTENTS 



189 



THE STRUCTURE AND RELATIONSHIPS OF THE POTAMOGETONACEAE AND AL- 



LIED FAMILIES (with plates xiv-xvni and three figures). Mintin Asbury Chrysler 161 



THE MALE GAMETOPHYTE OF DACRYDIUM. Contributions from the Hull Botani- 

 cal Laboratory. 99 (with plate xix). Mary S. Youn^ 



BRYOLOGICAL PAPERS. I. THE ORIGIN OF AIR CHAMBERS. Contributions from 



THE Hull Botanical Laboratory. 100 (with twenty-two figures), Charles R, 

 Barnes and W.J. G. Land -- 



THE DEVELOPMENT OF THE SPORANGIUM OF LYGODIUM. Contributions from 



the Hull Botanical Laboratory, ioi (with thirty-seven figures). R, Binford 214 



197 



BRIEFER ARTICLES 



Names of North American Trees. C. S. Sargent -_-.... 

 A Remarkable Case of Polyspermy in Ferns (with one figure). Wiiiiam Z. 



CURRENT LITERATURE 



225 



227 



BOOK REVIEWS 228 



CLIMATIC adaptations. ECOLOGY OF WEST AUSTRALIA. PLANT GEOGRAPHY 

 MIN'OR NOTICES -- - 



NOTES FOR STUDENTS 



231 



232 



NEWS - - 240 



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