Classification . 183 



act of functional value, as shown by the fact that 

 primary gonidia that have not conjugated also pro- 

 duce secondary gonidia capable of germination. The 

 secondary gonidia on germination produce slender 

 germ-tubes which enter the tissues and infect the 

 host. Conjugation also frequently takes place be- 

 tween the secondary gonidia, but is not absolutely 

 necessary in order to induce germination. 



A. EpisfOYG ivith raised hands combined to form a 



netivorh, 

 TiUetia tritici, Winter (figs. 53 — 56). 



Developing in the ovary, sori blackish or brownish 

 olive, remainiog covered by the epidermis, soon 

 becoming pulverulent, very fetid; resting-spores 

 globose, olive-brown, 14-20 fi diameter, ridges of 

 epispore 1-1 "5 fi high, combined to form a regular 

 network of polygonal meshes 3-3' 5 //- in diameter ; 

 primary sporidia linear, usually conjugating in pairs. 



TiUetia tritici, Winter, Kr. Fl. p. 110; Plow. 

 Brit. Ured. and Ustilag. p. 283; Sacc. Syll. vii. n. 

 3 760. 



TiUetia caries, Cke. Hdbk. p. 511 ; Cke. Micr, 

 Fung. t. V. figs. 84—91. 



In ovaries of Triticnm vulgare, T. speUa. Com- 

 mon. 



The infected ovaries give out a blackish, pulverulent 

 mass of spores when crushed, which has a very un- 

 pleasant smell, especially when moistened. 



TiUetia decijiiens, Korn. (fig. 52). 



Produced within the ovary and on the glumes ; 

 mass of spores black, fetid; resting-spores globose 



