394 AGRICULTURAL AND INDUSTRIAL BACTERIOLOGY 



animals. Aspergillus fumigatus is a common mold growing 

 upon decaying vegetable mattfer such as com. It forms 

 in culture media greenish or biuish-green, later brownish 

 masses. The conidiophores are abundant, short, club-shaped 

 and the sterigmata are terminal. 



Most cases of aspergillosis have been reported from birds. 

 In these the lesions are generally located in the lungs, in 

 the air sacs and in the hollow bones communicating with 

 them. In man and in animals (particularly the horse) 

 infection of the lungs is most commonly observed. The 

 organism may spread through the blood stream or possibly 

 through the lymph channels to other organs of the body. In 

 the lungs the air sacs and bronchioles are filled by the 

 growth of the fungus. 



It is probable that this organism grows on decaying 

 organic matter outside of the body. The feeding of moldy 

 grain or fodder may give ample opportunity for infection 

 by inhalation. This is undoubtedly especially true for 

 chicks. It has long been known that the feeding of moldy 

 grain to chicks frequently was followed by pneumomycosis. 



Genus Sporotrichum. — Organisms belonging to the 

 genus Sporotrichum are molds producing hyphffi which are 

 usually creeping and irregularly branched. Definite conidi- 

 ophores are not developed. The spores are produced on the 

 sides or ends of short branches singly or in clusters. They 

 are usually quite numerous, oval or spherical in shape and 

 transparent or very light-colored. One species has been 

 found to produce disease in both man and animals in the 

 United States. It is the Sporotrichum beurmanni. It is 

 described from multiple abscesses in man. In the horse it 

 is known to produce one of the types of epizootic lymphan- 

 gitis. The disease is characterized in the horse by the devel- 

 opment of nodules from the lymph glands lying under the 

 skin. These nodules are generally spherical. They enlarge 

 but do not open directly. Purulent material collects near 



