192 DISEASES OF FIELD & GARDEN CROPS. [CH. 



As the new growth enlarges, the appearance of the teleuto- 

 spore resembles E, with the tipper segment dark in 

 colour, and the lower one light. F and G show other 

 conditions of this stage of growth, the lower cell pushing 

 the upper one aside in an irregular manner ; sometimes 

 the upper cell becomes large and brown, whilst the lower 

 one remains small and almost colourless, as at H. A per- 



U H U J e^ r 11 K 



FIG. 89. 



Development of teleutospores in Puccinia RuUgo-vera, B.C. 

 Enlarged 500 diameters. 



fectly formed teleutospore is shown at J, and a ripe 

 example breaking into two portions at K. The two cells 

 of the teleutospore do not arise from a differentiation of 

 the cell contents, and the ultimate formation of a septum. 

 There is no septum in the outer wall of a teleutospore till 

 the two internal cells are mature. 



We are uncertain of the exact meaning that should be 

 attached to the two contained cells in Puccinia spores ; but 



