4- 



British Uredinea: and UstilaQinecE. 



like Puccinia spores, but have, in the European species, 

 generally two germ-pores in each cell, and these are placed 



J'ig. 3. — Chrysojnyxa rhododendri. Section of spore-bed showing the compound teleu- 

 tospores (a), one of which is in the act of germination, having emitted a promycelium (/) 

 from upper corner of its superior compartment. In most of the other spores germination has 

 commenced, e. The epidermal cells of the host-plant (R. hiysutiivi) ; iii, mycelial hyphse. 

 (De Bary.) 



at that end of the.cell which is nearest the septum (Plate III. 

 Figs. 22, 23 ; and Plate IV. Figs. 11, 13, and 14). 



Germination. — The period at which germination takes 

 place in teleutospores is subject to variation with the 

 different species of Uredines. In the greater number of 

 cases this process ensues only after the teleutospore has 

 remained for some considerable time in a state of qui- 

 escence or rest. Generally this resting period extends from 

 the summer or autumn of one year until the ensuing spring, 

 corresponding, in fact, with the conditions of the host-plant, 

 which of course, in the case of deciduous plants, is without 

 suitable foliage during the winter months into which the 

 fungus can gain an entrance. On the other hand, there are 

 several species in which teleutospores germinate as soon as 

 they are mature, without undergoing any resting period 

 (Leptopuccinia, Lepturomyces) ; while there are others 

 which have only a very short resting period (Z'. rubigo- 



