Studies on the Reproduction of Selected Species of Hypnea (Rhodophyta, Gigartinales) from Hawaii

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Abstract
Studies were conducted on the reproductive biology of H. cervicornis J. Ag., H. chordacea Kuetz. and H. nidifica J. Ag. from Hawaii [USA]. In all 3 spp. the tetrasporic phase was found throughout the year. In H. nidifica this was the only phase found. In H. cervicornis and H. chordacea sexual plants were also seen throughout the year, but tetrasporophytes were predominant. The formation and release of the carpospores and tetraspores in these 2 spp. did not seem to follow strict lunar periodicity but viable spores for biological or for commercial cultivation can be obtained from these seaweeds at any time desired throughout the year. Consistently the carpospores of both species were found to be larger than the tetraspores. The biological implications of these findings are discussed.