Fig. 4. Scanning electron microscopy of C. sporogenes vacated exosporium casings and augmented sporiduct. (a) Inside the exosporium casing (red arrow) an open tubular structure
(green arrow) is observed which is partially detached from the exosporium. Blue arrow indicates possible torn remnants of the sporiduct. Images b, c and d are the various
structures observed (red arrows) inside the exosporium casing