KEY TO BUDDING FUNGI 215 
FALSE YEASTS 
(After Guilliermond) 
1. Cells generally spherical, often forming a, 
pellicle but only after fermentation; 
pellicle always viscous without inter- 
vention of aIr... 2... ee eee eee Torula 
2. Cells generally elongated. -Pellicle ap- 
pears at the beginning of develop- 
ment with intervention of air. ..... Mycoderma 
3: Yeasts without ascospores, parasitic to 
animals... 0.0... cece cee ee eee Cryptococcus 
Anderson (1917), after a careful study of the field, has proposed the 
following key, in which the budding phase is predominant. He has 
retained many of the names proposed by Hansen: 
KEY TO GENERA OF BUDDING FUNGI 
(Anderson, 1917) 
I. Ascospores known. 
Vegetative cells single or attached in irregular col- 
onies, mycelium not developed, ascospores 
formed within isolated cells. ............ (Saccharomycetaces) * 
Spores globose or void: 
Spores on germination forming typical yeast 
cells. 
Ascus formation preceded by the conjugation 
of gametes... 02... cee ee eee 1. Zygosaccharomyces 
Ascus formation not preceded by the conju- 
gation of gametes: 
Spore membrane single ............ 2. Saccharomyces 
Spore membrane double....... .... 3. Sacchromycopsis 
Spores on germination forming a poorly de- 
veloped promycelium ..............4. 4. Saccharomycodes 
Spores pileioform or limoniform, costate....5. Willia 
Spores hemispheric, angular or irregular in 
form on germination forming an ex- 
tended promycelium ................ 6. Pichia 
Vegetative cells produced predominately by 
budding but forming a mycelium under 
some conditions asci terminal or inter- 
calary, differentiated from the mycelium.7. Endomyces 
* The genus Schizosaccharomyces, which does not bud, and the relatively unim- 
portant genera, Monospora and Nematospora, are not included in this key. 
