THE USE OF THE MANUAL 



87 



Fig. 20. Graphic representation of natural relationships among groups comprising 

 the genus Aspergillus. The abundance of species in the different groups is roughly 

 indicated by the size of the group boxes in the figure. 



could be extended, but sufficient have been cited to indicate that the various 

 groups, like the species which comprise them, often cannot be set apart 

 by sharp lines of demarcation. 



