THE ASPERGILLUS GLAUCUS GROUP 



105 



Colonies upon Czapek's solution agar with 20 percent of sucrose spread- 

 ing broadly and rapidly, plane or slightly wrinkled, orange-yellow, com- 

 monly characterized by broad zones of dull-green conidial heads (PI. Ill C, 

 and fig. 25, A and B) ; surface growth consisting of loosely woven hyphae 

 studded with orange granules enmeshing abundant yellow perithecia above 



Fig. 25. Comparative growth of members of the Aspergillus repens series upon 

 Czapek's solution agar containing 20 percent of sucrose; incubation at room tempera- 

 ture for three weeks. A and B, Typical cultures of A. repens. C, A. pseudoglaucus, 

 NRRL No. 40. D, A. pseudoglaucus, NRRL No. 45. 



which project abundant conidial heads, the whole colony and especially 

 the marginal areas and adjacent wall of the culture dish commonly over- 

 grown by a loose aerial network of hyphae bearing conidial heads and scat- 

 tered perithecia; reverse varying from yellow-orange to deep maroon. 



Perithecia very abundant, borne in loose networks of yellow to orange- 

 red hyphae (fig. 26 A), yellow, spherical to subspherical, mostly 75 to 100m, 



