TELEUTOSPORES 



35 



The teleutospores are generally produced in sori like those 

 of the uredospores ; they frequently arise on the same mycelium, 

 and very often on the same spore-bed, mingled with the uredo- 

 spores. If both are found in any species, the teleutospores are 

 always formed at least not earlier, and usually later than the 

 uredospores. Their primary function now is to tide over an 

 unfavourable period; for this reason they are sometimes called, 

 in England, winter-spores. They may be one-celled as in 



Fig. 23. Figures of various Teleutospores of Pucciniaceae (after Sydow). From 

 left to right, they are (in the top row) Puccinia roesteliiformis, P. conspersa, 

 P. globosipes, P. Megatherium, Uromyces gtobosux, Hapalophragmium 

 . Derridis ; (in the second row) P. appendiculata, P. Euphorbiae var. intit- 

 mescens, P. deformata, U. achrous, U. giganteus, U. Ipomoeae, Triphragmium 

 Cedrelae. All x 480. (Non-British.) 



Uromyces, two-celled as in Puccinia, radiately three-celled as 

 in Triphragmium, cruciately four-celled as in Pucciniastrum, 

 linearly many-celled as in Pliragmidium and especially in 

 Xenodochus (see also Fig. 23). But it is misleading to speak 

 of a many-celled spore : each cell, taken separately, is a spore 

 and can germinate by itself without reference to the others. 



3 — 2 



