8 



UNIVERSITY OF WISCONSIN STUDIES 



THE DISTRIBUTION OF THE COLON- AERCGKNKS GROUP 



When physiological or morphological characters are cor- 

 related with a definite habitat, their taxonomic significance is 

 greatly increased. The restriction of species of the higher 

 animals to a more or less definite habitat is too well known 

 to need discussion. Among the plants this relation is even 

 more marked and the fungi are sometimes limited in their 

 habitat to a single species of host plants. The source of the 

 various tentative groups into which we have divided our 689 

 cultures should be in a \\ay a test of the validity of this 

 grouping. The distribution of these groups according to their 

 origin is shown in Table V and Figure 7. 



TABLE V 

 SHOWING THE DISTRIBUTION OF CULTURES ACCORDING TO ORIGIN 



This collection cannot be taken as accurately representing 

 the relative distribution, because in some cases the isolation was 

 selective, as, for instance, when a special attempt was made 

 to get high ratio cultures from feces. No attempt was made 

 to isolate liquefiers and the results may be misleading in that 



