Biodiversity and taxonomy of the family Calypogeiaceae (Marchantiophyta) based on the morphology of plants and their young stages.

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The family Calypogeiaceae, Marchantiophyta, was studied to clarify its biodiversity in relation to the neoteny between the genus Mizutania and other genera based on the morphology of plants and their young stages. Male branches of Mizutania are newly discovered, and discussed about its highly differentiated neoteny. The family was taxonomically revised in Japan, and 18 species in 3 genera are recognized, including one new combination and three new synonyms. Hawaiian taxa of the family are also taxonomically revised, and 6 species in 3 genera are recognized, with a new synonym. And 5 species in 2 genera are recognized in Malaysia.