A find by a student in Ireland plugs a gap in the history of lager

mystery in the history of brewing was replaced by another. The solved mystery was where the specialised yeast needed to make lager came from. The new one was how it had got to lager’s , southern Germany—for the yeast in question had been .Lager seems to have originated sometime around the 15th century. Before that, all European beers were ales. The difference is that lager ferments and ages best in cool conditions, so requires , a cold-tolerant yeast species, for its production. Ales ferment nearer to room temperature. That needs a different yeast, , other versions of which are used by bakers to leaven bread.