152 A MANUAL OF THE ASPERGILLI 



duced at room temperature (fig. 37 D), but more abundantly at 37° C. 

 Conidial heads frequently small and generally of a lighter green color than 

 those of typical A. fumigatus. Perithecia quickly and abundantly pro- 

 duced in 'most strains dominating the colony appearance (fig. 37 E), 

 commonly up to 300 M in diameter, not colored, or very pale salmon, with 

 walls scarcely colored, consisting of a single layer of cells, crushing easily, 

 covered by a loose network of uncolored sterile hyphae. Asci abundant, 



Fig. 38. Ascospores of Aspergillus fischeri NRRL No 181 (- Thorn No 4651 2) 

 Upper left, center, and right represent surface, P^.^f^je^fiSKon 

 section in profile; lower center, surface in face view; and louer right, optical section 



in face view. 



8-spored, filling the perithecium within a few days, 8 to 10/x by 10 to 12/z 

 subglobose (fig. 37 F), breaking down quickly to leave the perithecium full 

 of ripe ascospores. Ascospores biconvex, uncolored, usually about 7 by 4/x, 

 consisting of a central body 5 by 4 M , with two frilled equatorial banks about 

 1 M in width, roughened with echinulations or anastomosing bands on each 

 convex surface (fig. 38), separating into two valves in germination. 



Culture NRRL No. 181 (Thorn No. 4651.2), received as type from 

 Wehmer in 1923, is apparently identical with numerous isolations rom 

 American sources. Many strains have been seen, including a series from 

 sputum of human cases showing lung involvement by X-ray examination. 



