中文摘要：

Grateloupia ramosa 王与 Luan sp。nov。(Halymeniaceae， Rhodophyta ) 最新从海南省被描述，南部的中国。有机体有下列词法特征：(1 ) 略呈紫色的红、软骨、光滑的 thalli 在高度的 510 厘米；(2 ) 压缩了与相反的安排忍受丰富的分支的 percurrent 轴；(3 ) 顶上的像爪的顶，在底压缩了到 24 厘米；(4 ) 外皮由椭圆或异常的房间和髓质的 36 层组成由紧缩的髓的细丝盖住；(5 ) 繁殖结构全部散布了叶状体，在分支的结束部分的底部特别集中；并且(6 )4 房间果胞的分支和 3 房间辅助房间的分支， Grateloupia 类型。词法 diff erences 被分子的 phylogenetics 基于 ribulose-1 支持， 5-bisphosphate carboxylase/oxygenase (rbcL ) 基因顺序分析。仅仅在从海南省的 Wenchang 和 Lingshui 收集的标本之间有 1 bp 分叉。新种类在 Halymeniaceae 的大 Grateloupia clade 被嵌入。在 G 之间的 pairwise 距离。在 Grateloupia 以内的 ramosa 和另外的种类从 26 ～ 105 bp ，在在在 Halymeniaceae 的大类 Grateloupia 的种类之间的 13111 bp 的 pairwise 距离以内。因此，我们作为 G 建议这新种。ramosa 王与 Luan sp。nov。

英文摘要：

Grateloupia ramosa Wang ＆ Luan sp. nov. （Halymeniaceae, Rhodophyta） is newly described from Hainan Province, southern China. The organism has the following morphological features： （1） purplish red, cartilaginous and lubricous thalli 5-10 cm in height; （2） compressed percurrent axes bearing abundant branches with opposite arrangement; （3） claw-like apices on top, constricted to 2-4 cm at the base; （4） cortex consisting of 3-6 layers of elliptical or anomalous cells and a medulla covered by compact medullary filaments; （5） reproductive structures distributed throughout the thallus, especially centralized at the bottom of the end portion of the branches; and （6） 4-celled Carpogonial branches and 3-celled auxiliary-cell branches, both of the Grateloupia-type. The morphological differences were supported by molecular phylogenetics based on ribulose-1, 5-bisphosphate carboxylase/oxygenase （rbcL） gene sequence analysis. There was only a 1 bp divergence between specimens collected from Wenchang and Lingshui of Hainan province. The new species was embedded in the large Grateloupia clade of the Halymeniaceae. The pairwise distances between G. ramosa and other species within Grateloupia ranged from 26 to 105 bp, within pairwise distances of 13-111 bp between species of the large genus Grateloupia in Halymeniaceae. Thus, we propose this new species as G. ramosa Wang ＆ Luan sp. nov.