122 A MANUAL OF THE ASPERGILLI 



ASPERGILLUS AMSTELODAMI SERIES 



Ascospores 4.7 to 5m by 3.6 to 3.8^, lenticular, colorless, with equatorial 

 furrow conspicuous, broadly V-shaped and flanked by broad irregular 

 ridges, with walls irregularly and unevenly ridged or roughened over the 

 entire surface. 



Included in this series are strains that differ greatly in colony appearance. 

 However, their close relationship is demonstrated by the similarity in size 

 and pattern of their ascospores and is further shown by the dark olive-green 

 color of their conidial heads, the bright yellow color of their perithecia, 

 and the absence of any red either in the colonies or their reverse. 



The following key is designed to show the variation that occurs within 

 the series and to offer a means of separating strains or groups of strains 

 that are culturally distinct : 



A. Colonies predominantly perithecial. 



1. Conidial heads abundant in central area and often in concentric zones 



A. amstelodami (Mangin) Thorn and Church 



2. Conidial heads widely scattered or lacking NIHIL No. 113 



B. Colonies predominantly conidial. 



1. Perithecia widely scattered, superficial NRRL No. Ill 



2. Perithecia abundant in a felted layer above the conidial heads 



A.montevidensis Talice and MacKinnon 



C. Colonies very thin, perithecia and conidial heads widely scattered 



NRRL No. 110 



Aspergillus amstelodami (Mangin) Thom and Church, The Aspergilli, p. 



113. 1926. 



Synonyms: Eurotium amstelodami Mangin, in Ann. des Sci. Nat., Bot. 

 (ser. 9) 10: 360-361. 1909. 

 E. repens var. amstelodami Vuill., Soc. Mycol. de France, 

 Bui. Trimest 36: 131. 1920. 



Colonies upon Czapek's solution agar (3 percent sucrose) restricted, 4 

 to 6 cm. in diameter, plane or closely wrinkled, yellow to dull yellow-gray 

 in color from abundant perithecia admixed with sterile hyphae and de- 

 veloping conidial heads; reverse uncolored, becoming tawny in age. 



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

 ing, 8 to 10 cm. in diameter, more or less wrinkled and zonate (PI. Ill E, 

 and fig. 32 A), perithecia very abundant and clustered in masses forming 

 a dense layer at the agar surface (fig. 26 D), bright yellow in color, lending 

 a characteristic appearance to the colony; conidial heads deep olive-green, 

 abundant in colony center and scattered more or less unevenly over the 

 whole surface, occasionally obscuring the layer of perithecia beneath. 



