KUNGL. SVENSKA VETENSKAPSAKADEMIENS HANDLINGAR. Band 55. N:o 5. 



CRITICAL RESEARCHES 



ON THE 



POTAMOGETONS 



BY 



J. O. HAGSTRÖM 



WITH 119 FIGURES IN THE TEXT 



COMMUNICATED NOVEMBER 24 1915 BY G. LAGERHEIM AND C. LINDMAN 



♦— 



STOCKHOLM 

 ALMQVIST & WIKSELLS BOKTRYCKERI-A.-B. 



BERLIX LONDON PARIS 



R. FRIEDLÄNDER & SOHN WILLIAM WESLEY & SON LIBRAIRIE C. KLINCKSIECK 



11 CARLSTRASSE 28 ESSEX STREET. STRAND 11 RUE DE LILLE 



