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(1855-1858), the Coleochaeteae (1860), Hydrodictyon (1861), and Pandorina (1869); the last-mentioned memoir bore the title Beobachtungen über die Paarung de Zoosporen. This was a discovery of fundamental importance; the conjugation of zoospores was regarded by Pringsheim, with good reason, as the primitive form of sexual reproduction. In a work on the course

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