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The purpose of this appHcation is to protect the name of the important bryozoan genus Alcyonidium Lamouroux, 1813 from the names Fucus and Ulva. When using these names for algae Hudson (1762 and 1778) included species now classified as Bryozoa, thereby inadvertently creating zoological genera. There appears no need to conserve the butterfly generic name Ulva Lindsey, 1925, now treated as a junior subjective synonym.doi:10.5962/bhl.part.275 fatcat:h6ze7qv55nfg7gpf6tlrtw5elm