Fruiting plants of Halimeda cryptica were observed for the first time in February and March, 1972. The fruiting bodies of this species differ from those of other Atlantic Halimeda in that they are much smaller and occur almost completely on the obverse side of the segments,
i.e. away from light. It is suggested that the ecology of H. cryptica, which grows in deep water on precipitous substrates, may provide an explanation for the position of its gametangia.
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