40 HARRY WARREN ANDERSON 



budding phase is secondary in importance, the final result of growth 

 in culture being a markedly branched, aerial mycelium. They propose 

 the name Zymonema Gilchristi for the organism described by Gilchrist 

 and Stokes ('95), and more thoroughly investigated by Ricketts ('01) 

 and others. This name should be adopted for the fungus, in order to 

 do away with the confusion which has arisen in recent years from the 

 use for it of such generic names as Blastomyces, Oidium, and 

 Cryptococcus. 



The accompanying key includes the genera of budding fungi, in 

 which the budding phase is predominant. This includes not only the 

 yeasts without spore formation, but also those developing ascospores. 



KEY TO GENERA OF BUDDING FUNGI 



I. Ascospores known: 



Vegetative cells single or attached in irregular 

 colonies, mycelium not developed, asco- 

 spores formed within isolated vegetative 



cells (Saccharomycetaceae*) 



Spores globose or ovoid : 

 Spores on germination forming typical 



yeast cells : 



Ascus formation preceded by the con- 

 jugation of gametes 1. Zygosaccharomyces 



Ascus formation not preceded by the con- 

 jugation of gametes : 



Spore membrane single 2. Saccharomyces 



Spore membrane double 3. Saccharomycopsis 



Spores on germination forming a poorly de- 

 veloped promycelium 4. Saccharomycodes 



Spores pileiform or limoniform, costate . . . . . 5. Willia 

 Spores hemispheric, angular or irregular in 

 form, on germination forming an ex- 

 tended promycelium 6. Pichia 



Vegetative cells produced predominantly by 

 budding, but forming a mycelium under some 

 conditions, asci terminal or intercalary, dif- 

 ferentiated from the mycelium 7. Endomyces 



II. Ascospores not known, i. e., Fungi imperfecti: 



Heavy, dry pellicle formed on liquid mediums.. 8. Mycoderma 

 No distinct pellicle formed: 



Vegetative cells forming a septate mycelium 

 under exceptional conditions but pre- 

 dominantly budding 9. Parasaccharomyces 



Vegetative cells formed only by budding. 



Cells apiculate, limoniform 10. Pseudosaccharomyces 



Cells frequently elongated into narrow, 



nonseptate hyphal threads 11. Pseudomonilia 



Cells typically yeast-like 12. Cryptococcus 



* The genus Schizosaccharomyces, which does not bud, and the relatively unimportant 

 genera, Monospora and Nematospora, are not included in this key. 



