50 ig m-:^ ^^ r- n ^1 i ^ m m m <^j mm r. wt X 



RESUME. 



Puccinia o-ra;nims Vers., P. glumarjini (Schm.) Eriks. c;t HeniL, P.triticina 

 Eriks., P. dispersa Eriks., P. shnplex (Körn.) Eriks, et Heim, and P. coroni- 

 fera Kleb, are all found in Japan. In other words, all the species of the 

 cereal rusts reported from Europe occur on our grain crops. 



Generally speaking, of these six species, P. glumaruin is the most common 

 in Japan, attacking wheat and barley to a large extent. P. triticina and P. 

 simplex are of common occurrence in Hokkaido, seriously attacking their 

 respective host. These two species are found also in Honshu (the Main Island). 



P. graviinis appears on wheat much later than either P. glumarum or P. 

 triticina both in Honshu and Hokkaido, and causes a very little or almost no 

 damage to the crop. P. coronifera is also practically of no economic impor- 

 tance in Japan. So far P. dispersa is known only from Hokkaido, where rye 

 is cultivated at some places for experimental purposes. The aecidium stage 

 of this species, however, is not yet found by us, and its teleutospores are very 

 rarely formed in Hokkaido, as far as my observation is concerned. The fact 

 may be that the fungus passes the winter in its uredo stage. 



Finally it must be added that at present nothing is known about the rela- 

 tion of our oat rust to Aecidium Rhamni japonici Diet., which occurs on 

 Rliamnus japonica in Japan. Aecidium-form of Puccinia Jiimalensis (Barcl.) 

 Diet, has also been reported by DiETEL on the same host from Japan. 



' Sapporo, Nov. 25, 1905. 



