Vol. XLIV 



No. 6 



HE 



Gazette 



December 1907 



f 



Editors: JOHN M. COULTER and CHARLES R. BARNES 



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CONTENTS 



On Twin Hybrids 



Hugo de Vriea 



A Contribution toward a Knowledge of the Genus 



Washingtonia 



S. B- Parish 



Araucariopitys, a New Genus of Araucarians 



Edward C. Jeffrey 



Differentiation of Sporocarps in Azolla 



Wanda M. Pfeiffcr 



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Current Literature 



New^ 



Tlie University of Chicago Press 



CHICAGO aad ^EW YORK 

 William Weilty Aa4 Sob, Loadoa 



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