CONTRIBUTIONS TO THE MYCOLOGICAIj FLORA 

 OF JAPAN. II.(') 



On the Uredineae Parasitic on the Japanese Gramineae. 



By 

 Seiya Itö, Xogakushi. 



(With Plates X— XII) 

 INTRODUCTION. 



The annual loss owing to the rust of cereals is often quite enormous. In 

 Europe and America, the disease has consequently attracted a good deal of 

 attention from old times. 



In i864-'65 de Bary (i) proved scientifically for the first time the 

 genetic relation between Piiccinia graviinis Pers., and /Ecidimn Berberidis 

 Gmel. The discovery of the heteroecism in the cereal rusts may be regarded 

 as the starting point in the history of the scientific investigations of the rust- 

 fungi. In 1S96, J. Eriksson with his assistant E. Henning published " Die 

 Getreideroste," which is regarded as a classical work on the subject in 

 question. The ajD^Dearancc of this great work has stimulated the investigation 

 on the same subject by botanists in many countries. Their attention has 

 especially been turned to biological questions. Among the investigators on 

 the subject, the name of P. DiETEL, E. FISCHER, Fr. BUBÄK, T. SOPPITT, P. 

 Sydow, W. Tranzchel, Marshall Ward, H. Klebahn and A. Carle- 

 ton are never to be forgotten by the students of Phytopathology. Recently, 

 Pole Evans (i) has contributed the idea, that many biological species can 

 also be recognized by their cytological characters. On the other hand, the 

 study of the sexual processes in the Uredineae has made a remarkable 

 progress for the last four or five years. And the relation of the cereal rust to 



(I) Prepared under tlie direction of Prof. Dr. K. .Miyabe. 



Contributions. I. — T. Miyake, On Puccinia, Parasitic on the Umbellifcrae of Japan. Journ. 

 of the Sapporo Agric. Coll. Vol. II. Pt. 3. 1906. 



