THE ASPERGILLUS GLAUCUS GROUP 



113 



to represent the fungus described by Spieckermann and Bremer (1902) and 

 are at the same time most abundant in the entire series, hence are consid- 

 ered as typical of A. ruber (figs. 29 A and 30 A). The general characters of 

 the remaining subgroups are listed to show the extreme cultural variation 



Fig. 29. Different colony types developed in the Aspergillus ruber series in three 

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

 NRRL No. 52; B, NRRL No. 70, characterized by thin colonies, with mycelium 

 largely submerged; C, NRRL No. 65, colony floccose, bearing abundant perithecia 

 and few conidial heads; andZ), NRRL No. 75, deep floccose colony with very abundant 

 conidial heads and only scattered perithecia. 



that is to be expected within the series, but specific names are withheld, 

 because to perpetuate or propose such would multiply rather than clarify 

 the confused nomenclature of this abundant and variable series of organ- 

 isms. 



