Flor is an unusual strain of yeast that, under certain winemaking conditions, forms a thick yeast layer atop maturing wine. This process is particularly desirable in certain types of sherry production where barrels are filled only five-sixths full so the presence of oxygen can facilitate the production of flor. This flor gives the wine a fresh taste with bready characterstics. (Wine,Beer,Spirits,Sake,Mead/Production)