THE ASPERGILLUS VERSICOLOR GROUP 



191 



conidiophores as short aerial branches, in still others a combination of both 

 growth types with colony centers initially floccose and outer areas almost 

 velvety, at first white, passing through shades of yellow, orange-yellow, tan, 



Fig. 55. Aspergillus versicolor, strain NRRL Xo. 227. Photomicrograph showing 

 details of head structure. Note particularly the double series of sterigmata, X 2100. 



to yellowish-green shades such as pea green or sage green (Ridgway, PI. 

 XLVII) depending upon the strain (PI. V C and D, and fig. 53 C and D) and 

 conditions of culture, occasionally with the green colors almost or com- 



