中国马尾藻属的研究 Ⅶ.宾德种群的三个新种

STUDIES ON THE CHINESE SARGASSUM Ⅶ. THREE NEW SPECIES IN SPECIES GROUP BINDERIA

在研究中国真马尾藻亚属SubgenusSargassum刺托组SectionAcanthocarpicae团徽托序亚组SubsectionGlomerulatae宾德系SeriesBinderiana宾德种群SpeciesGroupBinderia过程中，发现该种群新种3个，它们是中间马尾藻SargassumIntermediumTsengetLusp．nov.，模式标本于1975年5月15日由李伟新采自广西涸洲岛，模式标本号AST75－0594；琼海马尾藻SargassumqionghaienseTsengetLusp．nov，模式标本于1983年7月12日由陆保仁采自海南省琼海县沙，模式标本号CA83－0016；裂开马尾藻SargasumerumensTsengetLusp．nov，模式标本于1982年4月23日由陆探仁采自海南省三亚市鹿回头，模式标本号AST82－0413。模式标本均存于中国科学院海洋研究所植物标本室。

The present paper reports results of a taxonomic study of three newspecies of Chinese. Sargassum belonging to the Species Group Binderia ofSubsection Glomerulatae, namely: Sargassum intermedium Tseng et Lu sp. nov.,Sargassum qionghaiense Tseng et Lu sp. nov, and Sargassum erumpens Tseng etLu sp. nov. The type specimens are all deposited in the Herbarium of the Institute of Oceanology, Chinese Academy of Science, at Qingdao China.Sargassum intermedium Tseng et Lu sp. nov. is characterized by its;slender and linear leaves, entire or dentate at the margin; absence of, or obscuremidrib; its vesicles being elliptical to subspherical when young, spherical when mature; its receptacles being compressed above and subcylindrical below, with elongated spinulate at the apex, a few in the laterals. It is related to S. acutifolium(Greville, 1848) differing in its leaves with obscure or no midrib and itsvesicles, spherical when mature.Sargassum qionghaiense Tseng et Lu sp. nov. is characterized by its flattened primary branches, broad below, narrower above; shorter and narrower,compressed, secondary branches; membranous leaves, thin and broad-lanceolate,obtuse at the apex, obliquely cuneate at the base, denticulate at the margin,midrib being percurrent, obscure, with conspicuous, slightly raised, irregularly scattered cryptostomata. Vesicles small, subspherical when young, sphericalwhen mature, mucronate or rounded at the apices, and foliaceous with midribpedicels, entire or dentate at the margins. Plant androgynous. Receptacles flattened, ususlly forked, conspicuously spinulose at the apices and the sides, severalin glomerules. The new species,is related to S. binderi (J. Agardh, 1848 ), differing in its broad-lanceolate, thinner leaves, usually obtuse at the apex, with obscure midrib, smaller vesicles, smaller flattened receptacles.Sareassum erumpens Tseng et Lu sp. nov. is characterized by (1) brancheswith raised open glandules; (2) leaves oblong to lanceolate, with a few raisedopen conspicuous cryptostomata: (3) vesicles spherical, with conspicuous raisedopen cryptostomata; (4) receptacles subcylindrical to slightly compressed, cymoselyarranged in glomerutate. It is closely related to Sxishaense (Tseng C. K., LuBaoren, 1979), but differs in its oblong leaves, furcate receptacles, cymosely arranged in glomerulate. The latter has large lanceolate leaves and biserrulus receptacles.