Abstract
Evidence that sexual fusion does not occur in zoids from unilocular sporangia of Ectocarpus siliculosus is presented as follows: (1) Zoids from various types of unilocular sporangia do not interact with genuine gametes; (2) Aggregates of two zoids, previously claimed to be zygotes, were frequently seen in cultured material but could be demonstrated to be the result of incomplete cell separation during sporogenesis; (3) Culture studies showed that there is no fusion of male and female nuclei in such aggregates.
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