CULTURE EXPERIMENTS WITH MELAMPSORA IN 



JAPAN 



TAKASHI MATSUMOTO 



Graduate Student in the Henry Shaw School of Botany of Washington University 



Culture experiments with the heteroecious rust Melampsora 

 have been extensively undertaken by investigators in different 

 countries, especially in Germany. However, owing to the 

 diversity of local conditions and also the variability of the fungi 

 themselves, the data which are secured in one country can not 

 readily be accepted in others. The life histories of such 

 cious forms, therefore, require to be worked out for each 

 separately. 



heteroe 



first article ('15) of this study, the 



tionships between the different spore types of a few species of 

 Melampsora and the host species of Salix plants were for the 

 first time reported in Japan. The life histories which have 

 already been determined and reported by me are for the five 

 species arranged in the following key: 



Key to the Species 



A. Teleutospores subepidermal. 



a. Teleutospores amphigenous and uredospores hypophyllous 



1 



Uredospores 15-20 X 12-15 p. Teleutospores 20-37 X8-13 p 



On Salix opaca Anders /. M. Larici-opaca Miyabe and Matsumoto 



b. Teleutospores and uredospores mostly hypophyllous 2 



Uredospores 15-22X12-10 p. Teleutospores 18-40X7-11 p. 



On Salix Miyabeana v. Seem 



2. M. Larici-Miyabeana Miyabe and Matsumoto 



B. Teleutospores subepidermal, frequently subcuticular. 



a. Teleutospores amphigenous, but mostly epiphyllous. Uredo- 

 spores hypophyllous 3, 4 



Uredospores 13-19 X 11-15 p. Teleutospores 30-58 X8-13 p. 



On Salix viminalis L 3. M. Larici-epitea Kleb. 



Uredospores 14-18 X 1 1-14 p. Teleutospores 30-55 X 8-14 p. 



On Salix daphnoides Vill A- M. Larici-da ph noides Kleb. 



C. Teleutospores subcuticular. 



a. Teleutospores amphigenous, but mostly epiphyllous. Uredo- 

 spores mostly hypophyllous, frequently amphigenous 5 



Uredospores 18-29X12-10 p. Teleutospores 20-30X8-12 p. 



On Salix jessoensis v. Seem 5. M. yezoensis Miyabe and Matsumoto 



Ann. Mo. Bot. Gard., Vol. 6, 1919 



(309) 



