Klöcker (1909) in order to classify an undescribed, strongly fermentative yeast forming sphaeroidal, visibly verrucose ascospores, introduced the genus Debaryomyces. The single species on which the genus was based he named Debaryomyces globosus Klocker. Accepting the verrucosity of the ascospore as cardinal generic criterion, subsequent authors, notably Konokotina (1913), Guilliermond & Péju (1920, 1921) and Guilliermond (1928) assigned other species to Debaryomyces. These species, however, differed from the type species by being only weakly fermentative and utilizing a greater number of carbon sources.