Ustilaginecs. 273 



Ustilago longissima, Tul. Cooke, " Hdbk.," p. 512 ; " Micro. 

 Fungi," 4th edit, p. 229, t. v. figs. 105-107. 



Uredo longissima. Sow., t. 139. Berk., " Eng. Flor.," vol v 

 pt. li. p. 375. 



Exsiccati. 

 Baxter, 230. Cooke, i. 55 ; ii. 71. vize, " Fungi Brit.," 33. 

 On Glycerin aquatica ^ndjluiians. 

 Throughout the summer and autumn. 



Biology.— The affected plants seldom if ever develop their inflo- 

 rescence. Intermixed with the teleutospores are a number of pale cells 

 the function of which is unknown. For an account of the germination 

 of the teleutospores, see p. 81. 



Ustilago hypodytes. (Schlecht.) 

 Produced on the culms, beneath the leaf-sheaths, soon exposed, 

 black, with a tinge of olive, pulverulent. Teleutospores sub- 

 globose, oblong, or angular, pale yellowish brown, subtrans- 

 parent, smooth, 3-6 x 3-4- St^, mixed with others much larger. 



Syftonyins. 



CcBoma hypodytes. Schlecht., " Flor. Berol.," vol. ii. p. 129. 



Ustilago hypodytes, Fries. Winter, he. cit, p. 87 Cooke 

 "Hdbk.," p. 513; "Micro.' Fungi," 4th edit., p. 229, t. v. figs! 

 100, 101. 



Exsiccati. 

 Cooke, i. 56 ; ii. 433. Vize, " Fungi Brit," 35. 



On Triticum repensjunceum, Elymus arenarius, Bromus erectus, 

 Psamma arenaria. 

 June to November, 



Biology.— See p. 80. 



Ustilago segetum. (Bull.) 

 Produced in the receptacle and rachis, destroying the whole 

 inflorescence, dusty, black, with an olive-brown lustre. Teleuto- 

 spores globose or irregular, often flattened on one side, pale 



T 



