ISO 



A MANUAL OF THE ASPERGILLI 



suggestive of sclerotia; aerial mycelium more or less abundant, colorless 

 or yellow to orange; producing in many strains numerous large drops of 

 transpired fluid, pale to yellow or orange-red (acting as an indicator, chang- 

 ing from yellow with acid to orange-red with alkali) ; commonly 



Fig. 51. Aspergillus Jlavipes group. A, 

 Czapek's solution agar. 2 weeks, room tei 



.4. flaripes XRRL No. 295 growing on 

 temperature. B, Strain XRRL No. 287 of 

 the same species, found bv White (1943) to produce a penicillin-like substance. C, 

 Strain XRRL Xo. 1959 characterized by the production of an excessive amount of 

 exudate. D, Photomicrograph of a typical head showing the elongate vesicle and 

 crowded sterigmata in two series, X "50. 



characterized by a disagreeable odor approaching putridity. Heads 

 typically becoming columnar masses, shading from persistently white, 

 through shades of pale to deep avellaneous as in A. terreus; but usually in 

 rather sharp contrast to the color of the mycelium. Conidiophores from 

 300 to 500m by 4 to op. in crowded areas, up to 2 to 3 mm. in length and 



