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Fig. 6. Ustilago Zeae. 1, Smut spore, diploid nucleus; 2, reduction division has 

 taken place ; 3, promycelium formed ; 4, one daughter nucleus divided ; 5, other 

 nucleus dividing; 6, septa and sporidia are forming; 7, all four cells of basidium 

 separated and sporidia forming from each; 8, sporidium budding; 9, many 

 sporidia formed; 10, two sporidia (s) on surface of com plant have produced 

 mycelia which penetrated plant; hyphae united to form mycelium with paired 

 nuclei (n = nucleus of plant cell); 11, mycelium in plant came to surface of 

 plant at a, and reentered at stomatal opening (clamp-connection at c). From 

 W. F. Hanna, Phytopathology, 19, 415 (1929). 



