Abstract: Artificial culture of unicell spore of Atrichum undulatum (Hedw.) P. Beauv is performed successfully in this paper, and the authors research the whole process of that and take the photoes. through the research, we find that its spores have no post-maturation or domant period. They can germinate after 3-4 days and the rate of germination is over 95%. About 10 days later, its chlorone-mata, caulonemata and rhizoides begin to differentiate, almost on the 40th day bud primordium ap-pears, and then, around the 50th day, bud forms gradually. At last, nearly the 80th day, the whole plant finishes its vegetive growth and starts development of sexual organs. Its primary rhizoides devel-op poorly, and basai celis have no division, the way of chloronema's generating caulonema is complex and caulonema cell has three kinds of diastemas; spherical, declinate and transuerse, at the beginning of the differentiation of bud primordium, caulonema generates cell population that have high photosyn-thetic capacity, and bud primordium on its base. The rate of successful differentiation of the bud primordium is about only 50%, once bud forms, protonemata always perishes and specializes in rhizoides. The research discussed the morpha development, phyoiological ecology, generation, evolution and so on.

Key words: Atrichum undulatum, spores culture, developmental biology