316 THE FUNGI WHICH CAUSE PLANT DISEASE 



T. foetens. (B. & C.) Trel.^"' '''■ '^'' ''' 



Sori in ovaries, ovate or oblong, 5-8 mm. in length, more or 

 less concealed by the glumes, all or only part of the ovaries of 

 a spike infected; spores light to dark-brown, oblong to chiefly sub- 

 spherical or spherical, occasionally somewhat angular, foetid, es- 

 pecially when young, smooth, chiefly 16-22 m, the most elongate 

 rarely 28 /t in length. 



On wheat wherever grown. 



Kuhn'* found that infection occurs as in oats in the very 

 young plants. From the infection point 

 the myceliiun approaches the growing 

 point and follows the development of 

 its host, sendmg its branches into each 

 spikelet and finally into the growing 

 ovules. Here it develops a close knot 

 and in the ends of the threads and in the 

 short branches the spores form. The 

 spores germinate by a rather long, con- 

 tinuous, thick promycelium on the tip of 

 which a crown of long slender conidia de- 

 velops. The sporidia soon become arched 

 and often fuse in pairs; they develop in- 

 fection threads. 



Fig. 231.— T. foetens. A. T. trftici (Beij.) Wint.^^ 



fnTs'ridfa-TsporidS Sori in ovaries, ovate to oblong, 5-8 mm. 



which have united. One in length, more Or less concealed by the 



has produced a secondary ^ .i n i- i. i- u 



sporidium at X and this is glumes; stcnle cells lew, nyalme, sub- 



?h?^d^ ° Aft« '^^ spherical, with medium-thin wall, smaller 

 andStedman. than the fertile cells which are chiefly 



subspherical, light to dark-brown, with winged reticulations 

 about 1 |i high by 2-4 fi wide, and 16-22 n in diameter. 



On wheat everywhere. 



Experiments have shown this distinct from T. foetans which it 

 closely resembles except for its reticulate spores. 



t. texana Long: CU^ 



Sori in ovaries, ovoid or oblong, about 3-5 mm. in length, more 

 or less hidden by enveloping glumes, forming a somewhat agglu- 

 tinated light-reddish-brown spore-mass; sterile cells not very 



