中国褐毛藻属Halothrix的分类学研究

The morphological taxonomy on genus Halothrix (Choradariales, Phaeophyta) from China seas

对作者于1998～2003年间在中国沿海采集的褐毛藻属Halothrix标本进行了分类研究。经鉴定,确认有4个种,即可疑褐毛藻H.ambigua Yamada、细弱褐毛藻H.gracilis Luan et Ding sp.nov.、褐毛藻H.lumbricalis(Kuetzing)Reinke和垫状褐毛藻H.pulvinata Luan et Ding sp.nov.,其中新种2个。文中对这4个种进行了较详细的特征描述,以及较完整的其他分类学信息,并编制了检索表。细弱褐毛藻H.gracilis Luan et Ding sp.nov.的长同化丝稍细,直径15～55μm,中、上部细胞较长,长宽比为1.3～3;短同化丝的细胞较多,10～17个;具有匍匐丝体。垫状褐毛藻H.pulvinata Luan et Ding sp.nov.具有明显垫状的基部,由多数无色丝体组成,丝体细胞13～20个,细胞长宽比为1.3～11,长同化丝在基部多分枝。其研究结果在一定程度上丰富了我国大型海藻的物种多样性。模式标本保存在中国科学院海洋研究所海洋生物标本馆(AST)。

The specimens of genus Halothrix obtained from China coasts during 1998～2003 were investigated,Four species were identified,including two new ones,viz.H.ambigua Yamada,H.gracilis Luan et Ding sp.nov.,H.lumbricalis（Kuetzing） Reinke and H.pulvinata Luan et Ding sp.Nov.The taxonomic characteristics of these species were described in detail with other data referring to species classification.The new species were also included a Latin’s description of these characteristics based on rule of the Code of Botanical Nomenclature.A species’ key was created at last section in order to guidance retrieval.H.gracilis Luan et Ding sp.nov.was charactered by basal creeping filaments,thin long assimilating filaments with 15～55 μm in diameter and L/B 1.3～3 in the cells of the middle and upper part,and short assimilating filaments with 10～17 cells.H.pulvinata Luan et Ding sp.nov.was charactered by distinct cushion-shaped base,many hyaline filaments with cells number of 13～20 and L/B 1.3～11,and long assimilating filaments with many branches at the base.These results will rich the macroalgae species diversity data of China seas.Holotypes were preserved in the Marine Biological Herbarium,the Institute of Oceanology,Chinese Academy of Sciences（AST）.