Fig. 9. Phenotypic variability in Ustilago maydis due to differences in nutrients. Duplicate colonies of a monosporidial 

 line of V. maydis on 3 different media (Stakman, et al., 314). 



Fig. 10. Seven mutants of Ustilago maydis of a haploid line derived as segregate from a diploid line; parent in 

 upper left hand corner. Mutants again sectoring (Christensen, 55). 



22 



