Abstract: The perichaetium structure and origin of component of perichaetium of Hepaticae was studied through morphology comparing and anatomy research. We divided perichaetium of Hepaticae into Calyptra type, Perianth type, Coelocaule-perianth type, Coelocaule type, Perigynium type, Involucre type and Carpocephalum involucre type for the first time, among them, the Calyptra type was the most simple one and was the original group in evolution, the Carpocephalum involucre type was the most complex type and was the top class of evolution. We also presented diagrammatic sketch of perichaetium evolution and Diagramm perichaetia for expressing the structure and component of perichaetium.

Key words: phytum, bryophyta, liverworts, morphology of perichaetium