92 British Uredinee and Ustilaginee. 
the conidia reproduce themselves in from fifteen to.twen 
days. The teleutospores. are developed in spherical dil 
tations, in the continuity of the mycelial tubes, rare 
at the ends of branches. Conjugation between: conid 
sometimes takes place. The conidiophores emerge eith 
through the: stomata or between the epidermal cel: 
The conidia germinate more rapidly and throw out larg: 
germ-tubes when this process takes place on the livir 
leaves of the host-plant than when it does so in wate 
This may be in part due to: the more abundant supply « 
oxygen which they would receive in the former situation. 
E. canescens —Schroter * finds the spores germinate : 
soon as they are ripe by protruding a germ-tube, from 2 
to 30u long, and 4 wide, on the end of which a tuft « 
cylindrico-fusiform spores are produced. They measur 
from 25 to 40u in length, and from 2's to 3 in thickness. 
Doassansia.—The germination of this genus is ident 
cal with that of its ally, Entyloma, consisting in the prc 
trusion of a promycelium of limited growth, which develor 
apically a tuft of promycelial spores.t In D. alismat?s th 
promycelial spores are long and cylindrical, and they ar 
produced in great numbers (Plate VIII. Fig. 5). 
The process is also similar in D. sagiltart@, as observe 
by Fisch,} who observed conjugation to take place betwee 
the fallen-off promycelial spores. He found that the germ 
tubes of these spores entered the sides of the cells of th 
host-plant, having insinuated themselves between th 
epidermal cells. The teleutospores of D. alismatis germ: 
nated as soon as they were ripe, but those of D. sagittart 
did not do so until the ensuing spring. 
* Schroter, “Cohn Beitrage,” vol. ii, (1877), p. 372. 
t Commu, Ann. des Sctenc. Nat. Bot., 6° sér., tome xv. p. 281. 
} Fisch, ‘‘ Entwickelungsgeschichte von Doassansia Sagittariae,” Berich 
der deutschen botan. Gesellschaft,” September, 1882, bd. ii. t. x. 
