Buffered Charcoal Yeast Extract Agar (BYCE Agar) is For the isolation, cultivation, and maintenance of Legionella pneumophila and other Legionella species from environmental and clinical specimens. For the presumptive differential identification of Legionella species based on colony color and morphology. Legionella pneumophila appears as light blue/green colonies. Legionella micdadei appears as blue/gray or dark blue colonies.