Lactobacillus delbrueckii subsp. bulgaricus Lactobacillus delbrueckii subsp. bulgaricus Lactobacillus delbrueckii" subsp. "bulgaricus (until 2014 known as Lactobacillus bulgaricus) is the main bacteria used for the production of yogurt. It is also found in other naturally fermented products. First identified in 1905 by the Bulgarian doctor Stamen Grigorov, the bacterium feeds on lactose to produce lactic acid, which is used to preserve milk. "Lactobacillus delbrueckii" subsp. "bulgaricus" can be found naturally in the gastrointestinal tract of mammals living in Bulgaria, but one specific strain, "Lactobacillus bulgaricus" GLB44, is extracted from the leaves of the "Galanthus nivalis" (snowdrop flower) in Bulgaria as well. The bacterium is
Luzula nivalis is the species's basionym and was used before "L. arctica". "Luzula nivalis" is a relatively small perennial herbaceous plant (or "herb") which grows to heights of between in a caespitose fashion. "L. nivalis "has fibrous roots and ascending rhizomes, older plants have vertical stems either at ground level or underground; the plant base is straw-brown/pale castaneous brown in colour. The plant is subglabrous with erect, aerial stems and numerous alternate basal leaves. These crowded leaves are marcescent, flat, remain for many years, usually up to long and wide." L. nivalis" also has 1–2 cauline leaves which are long; both leaf