Ostilaginee. 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. ii. p. 375. 
Exsiccati. 
Baxter, 230, Cooke, i. 55; ii. 71. Vize, “ Fungi Brit.,” 33. 
On Glyceria aquatica and fluitans. 
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 atcount 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 3~4'5u, mixed with others much larger. 
Synonyms. 
Caoma hypodytes. Schlecht., “ Flor. Berol.,” vol. ii. p. 129. 
Ustilago hypodytes, Fries. Winter, Joc. cit, p. 87. Cooke, 
“ Hdbk.,” p. 513; “Micro. Fungi,” 4th edit., p. 229, t. v. figs. 
Ioo, IOI. P 
LEixsiccati, 
Cooke, i. 56; il. 433. Vize, “ Fungi Brit.,” 35. 
On Zyriticum repens, junceum, 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 
, 
