Study on freshwater genus Peridinium (Dinophyta) from China Observation on the Sexual Reproduction of Peridinium bipes Stein (Dinophyceae) THE SYNERGISM OF DPC AND KH_2PO_4 IN THE REGULATION OF ANATOMICAL STRUCTURE OF COTTON SEEDLING STEM Peridinium polonicum,A New Record of Freshwater Toxic Dinoflagellate from China Morphological Observation of a Freshwater Peridinium Strain and Phylogenetic Analysis of Peridinium