Fig. 1.

Scanning electron micrograph of a colony of Streptomyces lividans growing on an agar plate in the laboratory. At the edge of the colony, hyphae of the substrate mycelium are foraging for nutrients on the surface of the medium and burrowing into it, while in the central regions the aerial hyphae are beginning to produce spores. From Figure 6.01 of Hopwood (2007), reproduced by permission of Oxford University Press