1902.) 



]83 



On Ustilago Panici miliacei (Pers.) Winter. 



By 

 Y. Takaliashi, NugahusU. 



With Plate I. 



RESUME. 



Ustilago Panici miliacei occurs very abundantly on Panicum miliaceum 

 in Hokkaido (Yezo). 



Usually the whole inflorescence is changed into the smutpustule bear- 

 ing sometimes an undeveloped bract on or near its apex (Fig. I). 

 Tlie internode immediately below tlie inflorescence is often aftectcd 

 and forms the lower portion of the smutpustule ; in this case a more 

 or less well developed leaf is borne on the smutpustule (Figs. II and 

 HI). Partially smutted inflorescences are also very rarely found (Fig. 

 IV and V). 



The coating of the smutpustule consists of the e[»idermis of the host 

 and a layer of sterile hyphtc, which is in close contact with the inner 

 surface of the epidermis (Fig. VI). 



The smutpustule is traversed lodgitudinally by the vascular bundles of 

 the host and the strands of sterile hyphie, spoken of by Dietel^'^ as 

 Zellcomplt'xe in tlie case of Ustilago Ischasmi Fckl. 

 The hyphfe of these strands, which are similar to, but distinctly 

 bigger than, those of the coating, are close-septate and become 

 divided up into round or oblong simple cells, when the spores are 

 ripe (Fig. VIII). 



The spores are produced at the end of strongly gelatinized hyphal 

 branches which compactly intertwine forming a large ball. (Fig. IX 

 and XI). 



(1) P. Dictel :— Untersncli. iiber einige Brandpilze. Flora, 1897. 



