LIFE HISTORY OF RUST FUNGI 



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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 

 (crossrsection of leaf) ; myc, mycelium of the fungus ; is, aecidio- 

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



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

 of a stoma by and branching of the germ tube. X 475. (All except 

 E after Plowright.) 



