Fig. 2. Scanning electron microscopy of C. sporogenes dormant spores surrounded by their exosporium. (a) Red arrows point to a small aperture (0.3e0.4 mm) at one end of the
exosporium. (b) Projections at one end of the exosporium. Green arrows point to a lipped terminal protrusion (sporiduct). (c) Magnified image of the lipped terminal protrusion.
Blue arrows indicate a lipped end with a small opening.