n general, sourdough yeasts are enumerated on and isolated from Wallerstein Laboratories (WL) nutrient agar medium, yeast extract-peptone-dextrose agar (YPDA) medium, Sabouraud dextrose agar, yeast extract-glucose (YG) agar, and yeast and malt extract agar, supplemented with chloramphenicol as antibacterial agent, after incubation at 25–30 °C for 2–3 days (Huys et al., 2013). The first sourdough-specific yeast species isolated from spontaneous sourdoughs (in casu a San Francisco sourdough) was Saccharomyces exiguus ( Sugihara et al., 1971), reclassified later as Candida milleri and then as Kazachstania exigua, and most probably closely related to Candida humilis ( De Vuyst et al., 2014 and Huys et al., 2013). It forms a trophic relationship with the sourdough-specific LAB species Lactobacillus sanfranciscensis in that the yeast and LAB species are maltose-negative and maltose-positive, respectively