中国多管藻属Polysiphonia一新种

A NEW SPECIES OF POLYSIPHONIA(RHODOPHYTA) FROM CHINA

近期在对2007年和2008年两次采自海南岛的多管藻类的标本进行分类研究时,发现有数号标本,它们的藻体形态及内部构造特征有些不同于已知的多管藻属Polysiphonia的种类。经研究鉴定,结果表明,这些标本应是目前尚未报道的多管藻属的一个新种,命名为海南多管藻Polysiphonia hainanensis sp.nov.。

Based on the specimens of Polysiphonia collected from Hainan Island, South China Sea in 2007 and 2008, we found that the morphology of some specimens differ from other known species. After careful examination, we drew the conclusion that these specimens belong to a new species Polysiphonia hainanensis sp. nov. The description of the new species is given below： Polysiphonia hainanensis sp. nov. （Fig.l： 1--5; Fig.2） Description： Thallus erect and caespitose, 2--5cm high, up to 7cm, creeping branches in disorder at base, prostrate branches 125--132μm in diameter, of segments about 0.5--0.8 diameter long, attached by numerous unicellular rhizoids, which are cut off from the proximal ends of the pericentral cells and terminate in lobed discs; erect branches arising from creeping branches, segments compressed and short, 150--310μm in diameter, segments of main branch about 0.2 0.3 diameter long, every 2--3 segments in a spiral arrangement with 1/4 divergence, lateral brachlets at low a few, upper dense, cervicornis branching at more upper place, ultimate short and attenuated to a point apex, about 33.0--49.8μm in diameter, usually to outer turn curve; apical cell small, as a colorless awn point; trichoblasts once or twice forked, soon deciduous leaving, no scar-cells; pericentral cells 12 （--14）; ecorticate. Tetrasporangia spiraling somewhat in long continuous series the ultimate, subspherical to ovoid, （39.6--46.2）μmx（52.8--59.4）μm. Antheridial branches and cystocarps were not found. The present new species is closely related to Polysiphonia hendriyi var. luxurians Holl. in external appearance, branching, numbers of pericentral cells, ecorticate and color of frond, but this new species can be distinguished from Polysiphonia hendriyi var. luxurians Holl. by the thickset frond, 2--5 （--7）cm high, and the segments in the main axes commonly 0.2--0.3 diameters long. Remark： This new species is also closely related to Polysiphonia howei Hollenberg in Taylor by the pericental cells 10--12 and ecorticate, but differing in its frond small, 1--2cm high, prostrate, produced large patches （cushion） on rock, unbranched or with few to several short laterals, and tetrasporangia in spiral series. Etymatogy： The specific name hainanensis is named after the type locality. Holotype and paratypes are deposited at the Marine Biological Museum, Chinese Academy of Sciences （Qingdao）.