CABPOPEYTA. 



171 



356. (II) The conidia falling upon a wheat-leaf germi- 

 nate there and penetrate its tissues, sending parasitic fila- 

 ments into the cells. After a few days, if the weather has 



Fig. 95.— Wheat-rust. A and B, a Black-rust spore germinating, and pro- 

 ducing sporids, sp\ C, fragment of a Barberry-leaf with a sporid, sp, germi- 

 nating and penetrating the epidermis; Z), showing manner of germination of 

 Eed-rust spore.- All highly magnified. 



been favorable, the parasite has grown sufficiently to begin 

 the formation of large reddish spores (stylospores) just be- 



