On the Fine Structure of the Spermatozoids of Vaucheria Sescuplicaria and on the Later Stages in Spermatogenesis

In 1801 Vaucher discovered the oogonia of Vaucheria—or Ectosperma as he called it—but he described the antheridia in a very incomplete way without seeing the spermatozoids (Vaucher, 1801, 1803). These were first observed some fifty years later by Pringsheim (1855), who also saw fertilization, one of the first observations on fertilization to be made in the lower plants.