Pseudomonas fluorescens Produces a fluorescent pigment in the medium. Grows on nutrient agar. A photosynthetic, anaerobic, red bacterium. Also grows aerobically in the dark. Requires light and a special medium, growing atypically on nutrient agar.
Spirillum serpens Of morphological interest.
May grow on nutrient agar but requires very frequent subculturing to maintain viability. Grows on nutrient agar. Nutrient agar with added glucose can be used but grows better on special medium, as for Lactobacillus . Streptomyces griseus Responsible for the earthy odour of soil. Grows to form a fungus-like, branching mycelium with aerial hyphae bearing conidia.