motile rods with rounded ends, sometimes occurring in
chains. Many sporulating cells (Fig. 2a) and separately
lying refractive spores could be observed in old cultures.
One of the first observations under the optical microscope
during the growth of both bacterial strains on
Diesel fuel, naphthalene, and n-decan media was the
predominant fonnation of filaments by individual cells
(Fig. 2 b), in contrast to their growth on LB medium as
single cells (Fig. 2c).