Summary The name of the holotype of the generic name Penicillium Fr. (1832), “Mucor crustaceus L.”, is considered to be a nomen dubium and to probably represent a member of a genus other than Penicillium as currently conceived. In order to preserve current usage of the name Penicillium , the conservation of Penicillium Link ex Gray (1821) with P. expansum Link ex Gray as the lectotype species is proposed. Conservation is necessary as the publi‐
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Hawksworth et al. (1976) studied this question.
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