Genus/species: Oenococcus oeni (Leuconostoc oenos)
Gram Stain: Gram positive
ellipsoidal to spherical cocci, often in pairs or chains
Colonies develop after a few days. They are typically less than 1mm in diameter, smooth, round and greyish white. Colony growth is optimal at 20 to 30ºC on a sugar and protein rich medium that contains tomato juice substrate or grape juice.