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Colony of "Streptomyces coelicolor" A3(2) on Mueller-Hinton agar. Cultivation 25 days, 28°C. Colony is completely covered with aerial mycelium with spores. The bacterium produces antibiotic
actinorhodin (deep blue pigment colouring surrounding cultivation medium). Production of actinorhodin takes place when cultures of S. coelicolor A3(2)
enter the stationary phase.
Aerial mycelia are the forerunners of hyphal spores and differ from the substrate mycelia physiologically as well as by being considerably more hydrophobic. The formation of the
spores and aerial mycelia give a colony of Streptomyces its characteristic fuzzy, powdery appearance.
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