The phialides of Penicillium claviforme were examined with the light microscope, and as thin sections, with the electron microscope. Nuclear and spore wall arrangements during conidium production are described. The nuclear configurations are unlike those of normal mitosis. Spore wall formation and nuclear division are associated with the presence of membranous organelles resembling the mesosomes of gram-positive bacteria. The findings are discussed.
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Zachariah et al. (1967) studied this question.
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