CARPOPHYTA. 171 
856. (II) The conidia falling upon a wheat-leaf germi- 
hate there and penetrate its tissues, sending parasitic fila- 
iments into the cells, After a few days, if the weather has 
Fie. 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; D, showing manner of germination of 
‘Red-rust spore. All highly magnified. 
‘been favorable, the parasite has grown sufficiently to begin 
the formation of large reddish spores (stylospores) just be- 
