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A critical reassessment of the morphological features of two closely related red algal genera,Grateloupia C.Agardh and Sinotubimorpha W.X.Li & Z.F.Ding (Halymeniaceae),pointed out that members of the two genera had most morphological characteristics in common,including the Grateloupia type auxiliary cell ampullae.Sinotubimorpha hitherto was distinguished from Grateloupia by:(i) the hollow axis; (ii) the presence of secondary filaments in ampullae; (iii) 1- to 3-celled carpogonial branch; and (iv) the occasional production of 1- to 4-celled flanking filaments on carpogonium.However,when these features were re-examined among 37 Chinese species of genera described in Flora Algarum Marinarum Sinicarum and one newly reported species,Grateloupia orientalis,we found that it was difficult to draw a clear-cut distinction between the two genera based only on morphological differences.In rbcL sequence analysis,all the species of Sinotubimorpha with G.catenata formed a single monophyletic subclade within the large Grateloupia clade of the Halymeniaceae.It is therefore suggested that all the Chinese species of Sinotubimorpha,S.catenata,S.guangdongensis,S.qingdaoensis,S.claviformis,and S.ramosissima should be synonymous with G.catenata,and that Sinotubimorpha should be included in synonymy under Grateloupia.