Flor

A yeast vital for making Sherry. It's presence on the surface of the wine protects it from oxidation, and such a wine may be bottled as a Fino or Manzanilla. When it dies, it sinks to the bottom of the barrel, and the resulting wine is an Amontillado. If no flor develops at all, the resulting wine is an Oloroso. Partial development of flor, which then dies, produces a rare style known as Palo Cortado.