Posted on August 8, 2018August 13, 2018 by admin Microbiology: Lab 1, Serratia marcescens. Serratia marcescens 25 °C —Pigment prodigiosin. 37 °C —No pigmentation. Reference Cappuccino, J. G., & Welsh, C. (2018). Microbiology: A laboratory manual. Post navigationPrevious post: Microbiology: Dichotomous KeyNext post: Microbiology: Lab 11, isolating endospores.