Nature 193, 300 - 301 (20 January 1962); doi:10.1038/193300a0

Diploid Gametes in Ulva

BJÖRN FÖYN

Biological Station, University of Oslo, Dröbak.

IN the course of experiments on Ulva mutabilis ¹ some gametophytes are occasionally found forming swarmer which copulate neither with +-gametes nor with --gametes. These swarmers are diploid, as revealed by cytological and genetical examination. They are biflagellate and of normal size, and otherwise they fully resemble normal gametes. As do normal gametes, they also remain mobile for two days; then they fix themselves to the glass and develop into zoospore-forming plants. From the zoospores normal + and - gametophytes arise in equal numbers.

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