FIG. 1.

Colony morphology of the primary form (Vp) and small-colony variant (Vsm) of P. luminescens MD. (A) Colonies of 48-h-old Vp and Vsm; (B) colonies of aged Vp and Vsm; (C) colonies of aged Vsm with serrated edge in crowded area on TSAD plate; (D) colony of aged Vsm with serrated edge and stripes and fan-like sectors (arrows) in crowded area on TSAD plate; (E) colony of aged Vsm with fan-like sectors (arrow) in uncrowded area on TSAD plate. It is important to note that the aged colony was 17 days old. Bars, 0.5 mm.