Scanning electron microscopy (SEM) was used to investigate
further the structure and function of the aperture (Fig. 2).
C. sporogenes spores were surrounded by an exosporium that was
oval in shape and typically up to 3 mm in length. The exosporium
covers the entire spore and has a rough textured appearance.
Several species of Clostridium have an exosporium including
C. botulinum Groups I and II (Lund and Peck, 2000; Montville et al.,
1985; Stevenson and Vaughn, 1972; Takumi et al., 1979),
C. sporogenes