ON TWO SPECIES OF COLEOSPORIUM 

 PARASITIC ON THE JAPANESE COMPOSlTvC 



BY 



Naohide Hikatsuka. 



^ m m ^ 



Up to the present time, about forty species of Coleosporium parasitic on 

 Compositae have been described by many mycologists. Among them, about ten 

 species have been recorded from our countrj'. 



In 19 lo, Orishimo" studied the life cycle of Coleosponum Astenim (Diet.) 

 Syd. and proved successfully its genetic relation. No other Japanese species 

 of the genus have yet been studied on this line by any one up to the present. 

 Fortunately, the writer has collected Coleosporium Enpatorii Arth. and C. Saus- 

 sureae Thum. in a quite sufficient' quantity for the inoculation-tests and proved 

 their genetic connections. The present short paper is intended to report the 

 results briefly. 



The writer wishes to express his heartiest thanks to Profs. K. Miyabe and 

 S. Ito for their kind help and constant encouragement. 



I. Coleosporium Eapatorii Arthur 



In 1906, Arthur^ described a Coleosporiuui on Eiipatoriuin macrophyllum L. 

 collected in Cuba by E. W. D. Holw.W in 1903, as Coleosporium Enpatorii Arth. 

 Afterwards, he' ^^ added two species of Eupatorium, Eupatoriitm collitmm DC. 

 and E. Oestideanum Benth. to the host plants of this species in North America. 



1) Bot. Mag. Tokyo, XXIV, p. i (1910). 



2) Bull. Torr. Bot. Club, XXXIII, p. 31 figoe). 



3) North American Flora VII, p. go (1907). 



4) Ibid. VII, p. 654 (1924). 



[Trans, of Sapporo Natural History Soc. Vol. I.K, Part 2, 1927.] 



