Abstract
Until now, Halimeda cuneata has only been known from the Indo-Pacific region. Although this taxon is represented abundantly in local herbarium collections, its presence has never been registered for Brazil. Previous studies have probably mistaken Brazilian material of H. cuneata for H. discoidea or H. tuna, when not reported as Halimeda sp. Besides giving a detailed morphological description, we describe the gametangia and include information on ultrastructure and histochemistry, aspects that have been neglected in the characterization of the genus. The discovery of H. cuneata in Brazil provides additional evidence regarding the similarities between the Indian Ocean and tropical southwestern Atlantic marine flora.
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