[Arthrobacter siderocapsulatus isolated from lake water]

Two microbial strains have been isolated from lake water. The strains oxidize ferrous compounds and manganese. By the structure of microcolonies and the character of deposited oxides of these metals, the strains are identical to the genus Siderocapsa. However, according to their growth cycle and some morpho-physiological characteristics, they were included into the genus Arthrobacter (Corynebacteriaceae). Since these microorganisms differ, by their cultural and morpho-physiological properties, from other species of this genus, they were classed as a new species. Arthrobacter siderocapsulatus nov. sp.