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A MANUAL OF THE ASPERGILLI 



developing limited aerial growth, giving rise to widely scattered erect 

 conidial structures (fig. 76 A) characterized by dull greenish-tan heads not 

 affecting the color of the colony as a whole; reverse in brown shades; odor 

 Colonies upon hay infusion agar spreading broadly, almost wholly 



none. 



submerged, giving rise to scattered but conspicuous conidial structures 

 (fig. 76 B), often in definite concentric zones; heads globose, radiate, in olive- 



Fig. 76. Aspergillus sparsus: A and B, Colonies on malt extract and hay infusion 

 agars, respectively, 2 weeks; note scattered heads in B and almost complete absence 

 in A. C, Conidial heads, X 18. D, Single conidial head showing globose vesicle and 

 roughened conidiophore, X 425. 



buff shades (Ridgway, PI. XL). Colonies upon malt extract agar spreading 

 irregularly, floccose, 1 to 2 mm. deep, cream-buff in color ; conidial structures 

 very few in number; heads globose, radiate, dull olive-yellow in color 

 (Ridgway, PI. XL). Conidial structures generally few in number, never 

 abundant, erect, arising from a submerged mycelium; heads typically glo- 

 bose becoming more or less radiate in age (fig. 76 C), mostly 200 to 250m 



