THE ASPERGILLUS GLAUCUS GROUP 



119 



area (fig. 31 A) with abundant conidial heads in bli'e-green shades, dis- 

 tributed evenly over the whole surface or more crowded in localized areas, 

 projecting above a layer of abundant perithecia enmeshed in orange-red 

 hyphae at the agar surface; reverse in shades of orange-red to brown, more 

 intense in center. 



Perithecia abundant and closely enmeshed in a felt of orange-red en- 

 crusted hyphae (fig. 26 B), mostly 100 to 140m, occasionally up to 150^, 

 globose to subglobose, yellow to orange; asci 9 to 10/z; ascospores lenticular, 

 4.6 to 5.0/x by 3.4 to 3.8/z, with walls smooth, with equatorial crests prom- 

 inent, thin and often recurved, and with furrow consisting more of a trough 

 between parallel crests than an equatorial depression in the spore body 



Fig. 31. Comparative growth of members of the Aspergillus chevalieri series in 

 three weeks at room temperature upon 20 percent sucrose Czapek agar: A, Typical 

 A. chevalieri, NRRL No. 78; B, A. chevalieri var. intermedins, XRRL No. 82. 



(fig. 27 C). Conidial heads abundant, pale blue-green, appearing radiate 

 from divergent conidial chains, mostly 125 to 175^ in diameter, occasion- 

 ally larger; conidiophores mostly 700 to 850m in length, enlarging to a 

 vesicular apex, somewhat globose, 25 to 35/z in diameter; sterigmata in a 

 single series, closely packed, 5 to 7/x by 3 to 3.5/x; conidia subglobose, 

 spinulose, mostly 4.5 to 5.5m in diameter. 



Aspergillus chevalieri is represented in the present study by cultures 

 XRRL Xos. 78, 79, and others. The species name is limited to strains 

 bearing ascospores with smooth walls and prominent, thin equatorial crests 

 because it is believed that these strains most nearly represent the organism 

 described by Mangin (1909). When grown upon 20 percent sucrose Czapek 

 agar, these strains are further characterized by their predominantly orange- 



