SACCHAROMYCETACEAE 



47 



(b) Asci intercalary; spores ovoid, conglo- 

 bate Oleina 8:822 

 B. Mycelium biogenous 



1. Asci 4-8-spored 



a. Asci 4-spored, mostly lateral on long liyphae Endomyces 8:821; 6 



b. Asci 8-spored, on short hyphae from lobed 



haustoria; fungicole Podocapsa 8:820 



2. Asci niany-spored 



a. Asci on short hyphae from lobed haustoria; 



fungicole Podocapsium 24:1146 



b. Asci on long branched hyphae; fructicole Eremothecium 8:821 



Family 16. SACCHAROMYCETACEAE 

 8:916, 11:457, 14:828, 16:818, 18:198, 22:771, 24:1304 



True mycelium lacking, the hyphae reduced to short toruloid chains or to single 

 cells propagating by budding, rarely by fission; asci derived directly from vegetative 

 cells, or by isogamic or heterogamic copulation, 1-16-spored; spores 1-celled, globose 

 to acicular, hyaline, smooth or asperate, germinating by simple budding or by 

 conjugation. 



The yeasts are so greatly reduced that their position is far from certain, but 

 they appear to be derived from the primitive Ascomycetes rather than from highly 

 specialized forms. They seem to be most closely connected with the Endomy- 

 cetaceae, certain genera having been referred to both by different authors. A con- 

 siderable number of yeast-like forms do not produce asci, or these have not yet 

 been found, and all such genera have been referred to the Pseudosaccharomycetes, 

 at the end of the key. It is probable that many of these are actually Hyphomycetes, 

 in which growth has been emphasized at the expense of conidia formation. 



A. Asci regularly 1-spored, very rarely 2-spored 



1. Spores globoid, asperate 



a. Asci produced directly from the cells 



b. Asci derived from copulation 



(1) Asci derived directly from isogamic copu- 



lation 



(2) Asci derived indirectly from heterogamic 



copulation 



2. Spores ellipsoid, asperate, with median band 



3. Spores acicular, smooth; haemophile 



B. Asci not regularly 1-spored, mostly 2-8-spored 



1. Spores elongate, fusiform to acicular 



a. Spores flagellate; asci 8- or 16-spored 



b. Spores not flagellate; asci 4- or 8-spored 



2. Spores not elongate 



a. Cells arising by fission; asci 4- or 8-spored, 



derived from isogamic copulation 



b. Cells arising by budding 



(1) Spores with 2 walls, the outer breaking at 



germination; asci 2- or 4-spored 



(2) Spores with single wall 



(a) Spores with median band, hence appear- 



ing biapiculate 



(b) Spores not banded, globose to ellipsoid 

 X. Cells apiculate; asci 1-2-spored 



Micranthomyces 



Isomyces 22:786 



Nadsonia 22:786 

 Zonosporis 22:785 

 Monosporella 24:1315 



Nematospora 18:201 

 Coccidiascus 



Schizosaccharis 14:828 



Saccharomycopsis 18:198 



Williopsis 

 Thelis 24:1306 



