SUMMARY: Autolytically liberated spores of possessed an open-ended exosporium, which scanning electron microscopy showed as a flimsy integument draped around the rigid spore body. Critical point drying prevented collapse of the exosporium and a material connexion between spore and exosporium was observed in specimens prepared by this technique. A variety of electron-microscopic techniques showed that the exosporium possessed a relatively simple multilamellar structure, each lamella consisting of subunits arranged in paracrystalline array which in surface view displayed hexagonal symmetry. Possible model structures based on these findings are considered.


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