Morphology 485 



sporotrichum ; Robin, as an oidium; Quinquaud, as a syringo- 

 spora; Hallein called it Stemphylium polymorpha; Grawitz, 

 as Mycoderma vini; Plaut, as Monilia Candida; Guidi, Ress, 

 Brebeck-Fischer, as a saccharomyces ; Laurent, as Dematium 

 albicans; Linossier and Roux, as a mucor, and Alav, Olsen, 

 and Vuillemin, as Endomyces albicans. The matter is still 

 undecided and until it is finally agreed upon it seems best to 

 resort to the original name, Oidium albicans. 



Morphology. The organism consists of elements that 

 bear a close resemblance to yeast cells and multiply by bud- 

 ding, of hyphae and mycelial threads into which these grow, 

 and of chlamydospores and conidia. 



Fig. 158. Oidium. (Kolle and Wassermann.) 



The yeast-like elements measure 5 to 6 [i in length and 4 {i 

 in breadth. They have an oval form and cannot be distin- 

 guished from yeast cells. The mycelia are formed by elon- 

 gation of these elements, some of which appear slightly elon- 

 gate, some greatly elongate and slender and more or less 

 septate, like those of the true molds. They are refractile, 

 doubly contoured, and contain droplets, vacuoles, and gran- 

 ules. In the interior of the hyphae conidia-like organs often 

 appear, and chlamydospores appear. The latter are large, 

 oval, doubly contoured, highly refracting, and have been seen 

 by Plaut to germinate. 



The morphology is, however, extremely varied, and the 

 greatest differences of interpretation have been expressed re- 

 garding the different elements. 



