The Discovery Channel discusses how the ancestor of the lager yeast used in beers—such as pilsners, foreign and domestic—has been identified.
From the article's summary: (link addition mine)
- People have been searching for the wild ancestor of lager yeast for decades.
- Scientists finally located the yeast in the forest of the Patagonia region.
- The find reveals how the first batches of European lager were brewed in cool caves of Bavaria.