



■f ' 



Fig. 37. Aspergillus fumigatus group. A-C, A. fumigatus: A, Typical, heavy 

 sponng strain, XRRL No. 178, on Czapek's solution agar, 10 days, room temperature; 

 B, Floccose, light sporing strain of same species, XRRL Xo. 171 ; and C, Photomicro- 

 graph of typical conidial heads showing characteristic form of vesicles and crowded 

 stengmata in a single series, X 500. D-F, Aspergillus fischeri: D, Strain XRRL 

 Xo. 186, growing upon Czapek's solution agar, characterized by very abundant 

 perithecia and few conidial heads; E, Portion of a colony enlarged showing crowded 

 penthecia more or less obscured by loose enveloping hyphae, X 6.0; and F, Asci con- 

 taining ascospores at various stages of maturity, X 500. 



149 



