400 



VETERINARY BACTERIOLOGY 



Fig. 176. AspergiUus niger: 1, 2, 3, 4, Stages in the development of the con- 

 idiophores; 5, conidia; 6, detail, showing the branched sterigmata; 7, S. 

 sclerotia; 9, natural size of the fungus (Wehmer). 



organism has also been found in the ear and in lesions in the 

 lungs. 



Other Species of Aspergilli 



Several other species of Aspergilli have been reported as 

 pathogenic. Among them are AspergiUus nigrescens, A. subfuscus, 

 and A. glaucus. These produce nodular mycotic foci in the in- 

 ternal organs of laboratory animals into which they have been 

 injected. They do not commonly produce infection under natural 

 conditions. 



THE GENUS PENICILLIUM 



Penicillium is closely related to AspergiUus, the principal 

 difference being the manner in which the asexual >p<n > or conidia 

 are borne. The conidiophores are erect, and much branched at the 

 tip, the branches arising in whorl- ;inl arc not enlarged at the apex. 

 From the end of each ultimate branch a chain of spores is abjoint cd. 



