LIFE HISTORY OF RUST FUNGI 



179 



B 



on the surface, and the aggregation of protoplasm in the branched 

 apex, x 475. C, single teleutospore. X 200. D, germination 

 of teleutospore of another rust fungus and formation of sporidia. 

 X 475. E, aecidium cup of another form in vertical section 

 (cross-section of leaf) ; myc., mycelium of the fungus ; ce, aecidio- 

 spores; It. , leaf tissue; ep., epidermis of leaf. (After De Bary.) 

 X 150. F, germination of aecidiospore on a grass leaf, penetration 

 of a stomabyand branching of the germ tube. X 475. (All except 

 E after Plowright.) 



