Investigation has been made on the fresh-water algae as represented in a small but unique collection from Shigatze and Gyangtze districts, southern Tibet, gathered from May to August, 1961, by Mr. H. J. Hwang, an ichthyological worker during the Tibetan Scientific Expedition organized by Academia Sinica. The collection in the main consists of net plankton samples taken from various ponds, lakes, rivers and riverlets. To date, the writer has noted 196 species, varieties and forms, of which 1 belongs to the X...