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  • Kathryn Anne Poole

    Sakugoro Hirase observed swimming sperm (motile spermatozoids) for the first time in the seeds of a female Ginkgo tree growing in the Botanical Garden of the University of Tokyo in Japan on September 9, 1896. Hirase proved that the Ginkgo had an intermediate position between ferns and conifers and therefore Professor M. Engler established a new family Ginkgoacea (1897), order Ginkgoales (1898).

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