Active growth in common Grows well in usual Grows well in usual
nutrient liquids at nutrient liquids, nutrient liquids
37° C. even if acid
Usually no growth on Yellowish thick white Grows on potato;
potato; variable growth on potato transparent
glistening surface
In gelatine In gelatine amber On gelatine clear
stab-culture delicate colonies, becoming colonies with
feathery branching brown; may be bubbles radiating and
growth of gas encircling lines