440 Salmon : The Erysiphaceae of Japan 



Chinese and Japanese specimens in having usually more spores 

 has already been remarked (3). Tracy and Galloway, however, 

 have recorded (Bot. Gaz. 13: 29-32. 1888) the occurrence of 3 

 and 4 spores in the ascus in some American specimens. 



# 



ifera, Tokio). The 



specimen sent is too immature to enable me to give a full descrip- 

 tion of the plant. It appears, however, a distinct species, showing 

 affinity with U. Sengokui, but differing in the thicker-walled ap- 

 pendages, slightly narrowed upwards to the closely coiled 

 frequently helicoid apex. 



Dr. Hennings has also sent me an interesting form of Erysiphe 

 polygoni on Actinostcmma racemosum. This is remarkable in having 

 the perithecia more or less imbedded in the persistent mycelium. 

 Similar forms occur in Japan on Diervilla Japonica and Paeonia 

 oboi 'at a. 



The example of M. aim sent by Professor Hori on Sty rax 

 Japonicum from Tokio, Akabane (coll. Nambu and Nishida) is in- 

 structive in showing the variation that occurs in this species in the 

 mode of branching of the apex of the appendages. In this speci- 

 men appendages may be found on the same perithecium with long 

 or short primary branches (Figs. 25 and 26). 



The occurrence of Uncinula salicis var. Miyabei on Tilia Mi- 

 gueliana is extremely interesting. The specimen was sent by Pro- 

 fessor Miyabe, from Hokkaido, Prov. Ishikari, Shintotsugawa 

 (coll. T. Kawakami) and agrees well with the original examples 

 on Alnus incana and A. maritima. Professor Hori has sent speci- 

 mens on the last named host from Tokio, Todamura under the 

 MSS. name of Uncinula aggrcgata. It is possible that the present 

 plant will prove to be specifically disinct from £/". salicis. 



I give below the distribution of the species of the Erysiphaceae 

 occurring in Japan. 



Erysiphe cichoraccantm. — Europe (throughout); Africa (Al- 

 geria, Egypt); Asia (Persia, Turkestan, Siberia (Minussinsk) ); New 

 Zealand ; North America (United States (throughout) and Canada 

 (Ontario, New Brunswick, Newfoundland) ). 



E. galcopsidis. — Europe (throughout); Asia (Turkestan, Si- 

 beria (Minussinsk) ); North America (United States (throughout) 

 and Canada (Ontario, Newfoundland) ). 



