26 



MORPHOLOGY AND CULTURE OF MICROORGANISMS. 



tween the Mycoderma group of yeasts, Oidium and Monilia, and the well- 

 fixed mold types shows a number of organisms which are found repeatedly 

 in the fermentation industries (Fig. n). One of these, Monilia Candida, 

 as described by Hansen, has been much studied. In morphology, 

 Monilia Candida appears as a yeast in young cultures in sugary fluids, 



FIG. 10 Oidium lactis. a, b, dichotomous branching of growing hyphae; c, d, g, 

 simple chains of oidia breaking through substratum at dotted line x-y, dotted portions 

 submerged; e,f, chains of oidia from a branching out-growth of a submerged cell; h, 

 branching chain of oidia; k, I, m, n, o, p, s, types of germination of oidia under varying 

 conditions; t, diagram of a portion of a colony showing habit of Oidium lactis as seen 

 in culture media. (From Bui. 82, Bur. Animal Industry, U. S. Dept. Agr.). 



but later develops a mycelium. It produces an alcoholic fermentation 

 which increases in vigor with the rise of temperature toward 40. 



DEMATIUM. One species of Dematium, Dematium pullulans, has 

 been much studied. This is frequently found upon decaying fruit as 

 dark brown colonies. In culture, mycelium is sparingly produced, either 

 colorless or colored, and conidia are borne in clusters and chains all 

 along the hyphae submerged in the substratum. At first both mycelium 



