222 ESSENTIALS OF BACTERIOLOGY 



Oidium Lactis. Origin. In sour milk and butter. 



Form. The branches or hyphae break up into short, rod- 

 like spores. No sporangium, as in molds. 



Growth. In milk it appears as a white mold. 



Artificially cultured on gelatin plates, or milk-gelatin plates, 

 it forms satin-like, star-shaped colonies, which slow r ly liquefy. 

 Under the microscope the form of the fungus is well seen. 



Agar Stroke Culture. The little stars, very nicely seen at 

 first; then the culture becomes covered with them, causing a 

 smeared layer to appear over the whole surface, with a sour 

 odor. 



Properties. The milk is not changed in any special way. 

 It is not pathogenic for man or animals. It is found when 

 the milk begins to sour. 



Oidium Albicans (Soor ; Thrush Fungus, Langenbeck, 

 I ^39) Origin. Mucous membrane of the mouth, especi- 

 ally of infants. 



Form. Taken from the surface of the culture, a form like 

 yeasts; but in the deeper layers, mycelia with hyphae occur. 



Growth. Not liquefying; snow-white colonies on gelatin 

 plates. 



Stab-culture. Radiating yellow or white processes spring 

 from the line made by the needle, those near the surface 

 having oval ends. 



Potatoes. The yeast form develops as thick white colonies. 



Bread-mash. Snow-white veil over the surface. 



Pathogenesis. In man the parasitic thrush, or "white 

 mouth," is caused by this fungus. In the white patches the 

 spores and filaments of this microbe can be found. Rabbits 

 receiving an intravenous injection perish in twenty-four to 

 forty-eight hours, the viscera being filled with mycelia. 



Pathogenic Yeasts. A number of workers have inter- 

 ested themselves in experiments with yeasts in their relation 

 to disease; and under the name of blastomycetes, Sanfelice has 

 grouped yeasts that produce tumors resembling epithelio- 

 mata; and he has tried to prove that the so-called animal 

 parasites found in malignant growths, and variously known 



