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. LAGERIIEIM AND C. LINDMAN 



STOCKHOLM 



ALMQVIST & WIKSELLS BOKTBYCKERI-A.-B. 



1916 



