[Characteristics of yeasts that ferment lactose].

The crossing of the yeast species Saccharomyces cerevisiae with Sacch. fragilis and Sacch. lactis yielded a hybrid between Sacch. cerevisiae and Sacch. lactis. The hybrid was eliminated as the result of genetic splitting. The species Sacch. lactis is proposed to be excluded from the genus Saccharomyces and included into a new genus together with Sacch. fragilis.