ADVANCES IN AQUATIC HYPHOMYCETES
水生丝孢菌研究进展

Progress in the study of the freshwater hyphomycetes on submerged decaying leaves, especially dicotyledonous trees and shrubs, since the discovery of the fungi in 1942, is reviewed. About 80 genera and 200 species are now recorded all over the world. And 20 genera and 28 species have been found in China. Perfect stages of 15 species of t2 genera have been discovered. The majarity of them are ascomycetes while the minority are basidiomycetes. The fungi excrete kinds of extracellular polysaccaridases. So they can utilize various carbon sources very well. Nitrogen and mineral elements requirements are also concerned. Some plant pathogenic aquatic hyphomycetes are noted. Much attention is given to ecological problems. Investigation has revealed that aquatic hyphomycetes reach its peak in autumn and winter or low-temperature environments. The fungi play an important role in the food chains in freshwater biosystem. Terrestrial occurrence and dispersal of the fungi is discussed as well. Research prospects of aquatic hyphomycetes are mentioned at the end of this paper.