USTILAGO 343 



when smothered with the sooty mass of spores, which en- 

 danger neighbouring healthy plants. Spores variable in form, 

 subglobose, oblong or elliptical, 8-16 X 7-14 /^, brown, smooth, 

 or minutely granulated. 



Bamboo smut {Ustilago Shiriana, Henn.) attacks a large 

 kind of cultivated bamboo (Phyllos tacky s) in Japan ; wild 

 kinds are also attacked. The injury caused is considerable, 

 the internodes and tips of the younger shoots being attacked, 

 often commencing under the young leaf-sheaths. 



Spores subglobose or ellipsoid, smooth, 4-7 x 3 '5-6 //.. 



Spraying with Bordeaux mixture, and sprinkling the soil 

 with lime before the shoots appear, has proved to be of 

 service. 



Hori, S., Bull. Imp. Centr. dgr. Sta. Japan, 1, p. 72 

 (1905)- 



Ustilago sorghi (Pass.) forms spore-masses in the ovary of 

 Sorghum vulgare and S. saccharatum, filling it with a dusty, 

 sooty mass of spores. The anthers are also infected, and as 

 a rule all the flowers in a head are infected. 



Spores globose or irregular, smooth, pale olive, 5-9*5 X 



4*5-5 P- 



Ustilago reiliana (Kiihn) attacks Sorghum vulgare and S. 



halapense in different parts of the world. The ear is attacked, 



the spore-masses roundish or elongated, at first enclosed in a 



silvery-white membrane, then powdery and soon dispersed, 



leaving only the more durable parts of the ear as a skeleton. 



Brefeld states that the spores germinate after being kept for 



eight years. The secondary spores also, if kept dry, retain 



the power of germination for some time. Spores brown, 



delicately echinulate, 9-12 fi. 



Ustilago cruenta (Kiihn) attacks the top of the culm and 

 inflorescence of Sorghum vulgare, forming reddish-brown 

 patches and causing much distortion of the parts attacked. 

 Spores subglobose, olive-brown, smooth, 5 12 x 5-9 /*. 



Ustilago sacchari (Rabenk.) attacks the leaves of the sugar- 

 cane, more especially the upper ones while yet unexpanded, 

 and embracing each other, the whole being converted into a 

 projecting, discoloured, twisted spike. Spores angularly 

 globose, brown, smooth, 8-18 /i. 



Ustilago emodefisis, Berk. (= Ustilago treubii, Solms. Lau- 



