Stock Photo: MICROCOCCUS LUTEUS. MICROCOCCUS LUTEUS Micrococcus luteus, scanning electron micrograph colorized SEM, x 21 930 Micrococcus luteus is Gram_positive coccus, strict aerobe, usually present under the form of diplococci pairs, tetrads four and sarcinas eight. This bacterium is a saprotroph feeding on decaying organic matter and not pathogenic for mankind except for immunocompromised persons affected by AIDS. Micrococcus luteus regrouping the old species Micrococcus flavus, Sarcina lutea and Sarcina