Fig. 72. Aspergillus flavus. A, Typical strain, NRRL No. 1957, showing crowded 

 conidial heads and occasional black sclerotia. B, Heavy sclerotium producing 

 strain, NRRL No. 500. C, Strain used for the production of kojic acid, NRRL No. 

 484 (This approaches the character of A. oryzae). D, Dr. White's strain of A. flavus 

 (NRRL No. 501) showing characteristic thin growth and sparse sporulation. E, 

 Typical conidial heads, X 18. F, Single head showing vesicle, sterigmata, conidia, 

 and the roughened conidiophore, X 780. All cultures on Czapek's solution agar, 

 10 days. 



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