DESCRIPTIONS OF THE BRITISH 

 USTILAGINE/E. 



USTILAGINEiE. Schroter. 



Fungi parasitic in the tissues of living plants. Mycelium 

 widely spreading, but soon vanishing. Teleutospores produced 

 in the interior of mycelial branches, which often become gelati- 

 nized. Germination of the spores by a promycelium and pro- 

 mycelial spores (sporidia), or by continuous sprouting, after the 

 manner of yeast-spores. 



Ustilago. Pers. 



Teleutospores simple, produced in the interior of much gela- 

 tinized swollen hyphee ; when mature forming pulverulent masses. 

 Germination by a septate promycelium, which produces pro- 

 mycelial spores (sporidia) both laterally and apically, but principally 

 the former. 



* Teleutospores smooth or obscurely punctate. 



Ustilago longissima. (Sow.) 



Forming long parallel lines, mostly on the upper side of the leaves, 

 soon pulverulent, olive-brown. Teleutospores globose, some- 

 times discoid, often irregular, pale olive-brown, smooth, 3"5-4/x 

 in diameter, 6-7/x long. Promycelia veiy short. 



Synonyms. 



Ustilago longissima. Winter in Rabh., "Krypt, Flor.," vol. i. 

 p. 85. 



