196 CLASSIFICATION OF THE YEASTS 



Genus XIV. Nematospora. Peglion 



Budding yeasts, ascs with 4 fusiform ascospores, terminating with 

 a cilium. 



Family of Non-Saccharomycetes 

 Budding yeasts but forming no ascs. 



Genus I. Torula. Turpin 



Generally spherical cells, often forming a scum but only after 

 fermentation; scums always slimy without the presence of air bubbles. 



Genus II. Pseudosaccharomyces. Klocker 

 Apiculate cells. 



Genus III. Mycoderma. Persoon 



Cells generally elongated; scums are formed at the end of devel- 

 opment with the presence of air bubbles. 



Genus IV. Medusomyces. Lindau 

 Scums appearing at the beginning thick, stratified and gelatinous. 



Genus V. Cryptococcus. Kutzing-Vuillemin 

 Yeasts without ascs, parasitic to animals. 



There now remains a descriptive study of species of yeasts. We 

 shall describe all of the yeasts which are actually known. The yeasts 

 are excessively numerous and space will not permit an examination of 

 all of them. Many of the industrial yeasts, well known on account of 

 their physiological properties, have not been studied morphologically 

 and have not been given provisional names. Finally many of the 

 Torula and Mycoderma and pathogenic yeasts have been insuffi- 

 ciently characterized. It will be necessary to pass over those which 

 are not completely described and devote our attention to those which 

 are more fully characterized. 



