Coenzyme Q system in the classification of some ascosporogenous yeast genera in the families Saccharomycetaceae and Spermophthoraceae

The Co-Q systems of 11 strains representing the generaSchwanniomyces, Lodderomyces, Lipomyces, Nematospora andMetschnikowia were determined. All the genera were characterized by the Q-9 system except for the genusNematospora with needle-shaped ascospores. The only species,Nem. coryli, was found to have the Q-6 system. These results are discussed from the taxonomic point of view. This constitutes Part VII of a series entitled “Significance of the coenzyme Q system in the classification of yeasts and yeast-like organisms.” The abbreviations used here for coenzyme Q or ubiquinone are: Co-Q, coenzyme Q; Co-Q _n , Q-n or Q _n withn denoting a specified number of isoprene units in a side chain, e.g., Co-Q₆, Q-6, Q₆, etc.