SOME NEW RECORDS OF BACILLARIOPHYTA IN CHINA New Materials of Navicula ( Naviculaceae) from Anhui, China Contribution to the diatom flora of Cambodia: Five new recent freshwater taxa New Taxa of Diatom (Bacillariophyta) from Xizang (Tibet) (II) A New Species of Eunotia (Bacillariophyta) from Anhui, China New Taxa of Diatom (Bacillariophyta) from Xizang (Tibet)(I)