396 



VETERINARY BACTERIOLOGY 



eider-duck, parrot, pigeon, chicken, hawk, bullfinch, plover, 

 pheasant, bustard, duck, goose, ostrich, swan, and turkey among 

 birds, from the horse, dog, and cow among animals, and from man. 

 It has been reported from Europe and the United States. 



Morphology. In culture-medium it forms greenish or bluish 

 gray or later brownish masses. The conidiophores are abundant, 

 but short. The enlarged tip of the conidiophores is hemispherical, 

 and 8 to 20 ^ in diameter, bluish-green, and later brown. The 



Fig. 173. Aspergillusfumigatus: 1, Optical section through a conidiophore; 

 2, conidiophore and conidia; 3, conidia; 4, a, perithecium; b, an isolated ascus; 

 c, d, ascospores, front and lateral view; 5, swollen hyphae, bl, and conidiophores 

 (4, a-d, after Grijns, remaining after Wehmer). 



perithecia with ascospores have been observed in culture-media. 

 In the lung tissues the branching mycelium may be observed on 

 microscopic examination, and the sporophores may be seen pro- 

 jecting into the air-sacs, where the conidia are produced. These 

 spores are never formed except in the presence of oxygen. 



Isolation and Culture. The Aspergillus fumigatus may be 

 readily isolated from the lesions upon almost any of the commonly 

 used artificial media, particularly when spores are produced. For 



