PLATE 92 



Manner of germination of the spores of the two orange-rusts. The spores were 

 collected at the same time, placed in Beyerinck agar, and incubated at about 25° C. 



A. — Spores taken from leaves of the black raspberry, showing long, wavy germ 

 tubes. X38. 



B. — Spores taken from wild blackberry leaves, showing promycelia and numerous 

 sporidia. X85. 



