Micrococcus luteus

Micrococcus luteus is a Gram positive, spherical, saprotrophic bacterium that belongs to the family Micrococcaceae. An obligate aerobe, M. Luteus is found in soil,dust, water and air, and as part of the normal flora of the mammalian skin. The bacteria also colonizes the human mouth, mucosae, oropharynx and upper respiratory tracts.

http://en.wikipedia.org/wiki/Micrococcus_luteus