MOLDS AND YEASTS AND DISEASES' CAUSED BY THEM 245 



in the substratum but also extending into the air. The peripheral 

 threads are divided by septa to form chains of oval or spherical 

 conidia. 



This mold may be readily obtained for study by making plate 

 cultures from compressed yeast. 



Fig. 97. — Oidium albicans. A deep colony on a plate culture of the liquefying 

 variety, showing chlamydospores. (After Plant.) 



Oidium Albicans (Monilia Candida.)^ — The thrush fungus 

 was discovered by von Langenbeck in 1839 and by Berg in 1841, 

 but the popular recognition of a relation between this disease and 

 a mold seems to have preceded this discovery by many years. 

 Bferg (1841) transferred the fungus from cases of thrush to healthy 



