358 CLASS ASCOMYCETEAE 



Key to the Families of Order Saccharomycetales and Appended Fungi 



Asci formed, at least under special conditions. 



Under normal conditions producing a mycelium of uninucleate or multi- 

 nucleate cells. 

 Asci containing from one to eight ascospores. 



Family Endomycetaceae 

 Asci containing very numerous ascospores. 



Family Ascoideaceae 

 An alternation of haploid and diploid generations. 



Family Spermophthoraceae 

 Under normal conditions producing a yeast type of growth. 



Cells dividing by fission. Family Schizosaccharomycetaceae 



Cells multiplying by budding. Family Saccharomycetaceae 



(The following key is based upon Lodder, 1934.) 

 Ascus formation unknown (Asporogenous Yeasts). 



No violently expelled aerial spores formed (baUistospores) 

 Without carotinoid pigments 



Cells reproducing by budding, but also producing aerial conidia on short 



conidiophores or sterigmata Family Nectaromycetaceae 



Cells reproducing by budding, but aerial conidia lacking. In some cases 

 short chains of buds formed or even hyphae. Many parasitic in Man and 

 other animals. Family Torulopsidaceae 



Cells with carotinoid pigments, reproduction mostly by budding, no true 

 conidia or hyphae Family Rhodotorulaceae 



Aerial conidia formed which are violently expelled, usually also budding 

 present Family Sporobolomycetaceae 



Keys to the Commoner Genera of Saccharomycetales and Appended 



Fungi 



Key to the Commoner Genera of Sporogenous Yeasts Included in Families 

 Endomycetaceae, Schizosaccharomycetaceae, and Saccharomycetaceae 



(Based upon Stelling-Dekker, 1931) 



Spores spindle-shaped. 



Only one spore per ascus. Parasitic in Arthropods. Monosporella 



At least four spores per ascus. 



Spores with a nonmotile, flagellum-like extension at one end. Parasitic in 

 plant tissues. 

 Mostly growing in yeast-like colonies. Nematospora 



Mostly growing as hyphae ; ascospores formed in the terminal portion of a 

 hyphal branch, not separated by a septum from the remainder of the 

 hyphae. Ashbya 



Spores without flagellum-like extension. 



Parasitic in plant tissues, forming hyphae. Eremothecium 



Parasitic in insects, hyphal formation lacking. Coccidiascus 



Spores not spindle-shaped. 

 Producing true hyphae. 



No production of oidia or budding cells. Asci mostly eight-spored. 



Eremascus 

 Oidia produced, asci mostly with four or fewer spores. Endomyces 

 Asexual reproduction by budding, rarely by oidia. Endomycopsis 



