lOULDS 321 



These last three mucors are pathogenic. Intravenous 

 injection of fluid containing their spores causes a fatal 

 disease in rabbits. 



Aspergillus niger, A. albus, and A. glaucus grow upon 

 bread, candied fruit, etc., on which are seen the stout 

 swollen club-like fructifying hyphse, upon which are 



Pig. 30. — AspBRGiLLirs Glaucus. 



arranged the sterigmata. The latter two organisms grow 

 best at blood-heat, when they soon overgrow the nutrient 

 medium owing to their rapid growth. 



Aspergillus Flavescens and A. Fumigatus. — The former 

 is distinguished by its well-marked fructifications and the 

 greenish colour of its culture, the latter by its fine fructifica- 

 tions and ash-gray fur. On gelatine plates the filaments 

 grow rapidly into the medium, causing its liquefaction. 

 Both organisms grow at blood-heat. Both are pathogenic, 

 growing in various parts of the body — particularly the ear, 

 producing the disease known as otomycosis ; they have been 

 also found growing in the lungs and on the nasal mucous 

 membrane. The spores cause the death of rabbits on intra- 

 venous injection. 



Penicillium Glaueum.— The Penicillium glaucum is the 



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