Classification, 175 



black; resting-spores globose or broadly elliptical, 

 pale brown, minutely warted, 14-20 or 17-20 x 10-14 



Ustilago histortarum, Korn. Hedw. 1877, p. 88 

 Plow. Brit. Ured. and Ustilag. p. 277; Sacc. Syll. 

 vii. 2, n. 1710. 



On living leaves of Polygonum historta and Bumex 

 ohtusifolius . Rare. 



Ustilago olivacea, Tul. 



Appearing in the inflorescence, becoming pulveru- 

 lent, dark brown with olive tinge ; resting-spores very 

 variable in form and size, globose, angularly globose, 

 broadly elliptical or elongated, pale brownish-olive, 

 smooth, or sometimes minutely granular, the spherical 

 spores measure about 5-6 /j, diameter, the elongated 

 forms reach to 16x6 yu,; promycelium minute, fusoid, 

 aseptate. 



Ustilago olivacea, Tulasne, . Ann. Sci. Nat. p. 88 

 (1847); Sacc. Syll. vii. ii. n. 1682 ; Plow. Brit. Ured. 

 and Ustilag. p. 277; Cke. Hdbk. p. 513; Cke. Micr. 

 Fung. t. vi. figs. 126, 127. 



In the inflorescence of Carex riparia. Not un- 

 common. 



Ustilago hromivora, Fisch. de Waldh. 



Produced in the inflorescence, soon becoming 

 pulverulent, black ; resting-spores globose, broadly 

 elliptical, or angularly globose, dark brown, epispore 

 very minutely granular, 8-14 x 6-10 fi ; promy- 

 celium short, 1 -septate, sporidia terminal or lateral, 

 fusoid. 



Ustilago hromivora, Fischer de Waldheim, Aperyu, 



