XVI International Botanical Congess

Mono-, di, and triploids plants are known in Dumortiera hirsuta complex (Marchantiales, Hepatics). Data from allozyme, cytology and morphology suggest the following results, 1. There are more than three gspeciesh in monoploids in Asia. They have unique distribution areas and also can be distiguished by morphological features. 2. Diploids and triploids plants show fixed heterozygosity in several loci and thus they are interpreted to be allopolyploids. This means that they originated by hybridization between monoploid species. 3. Triploids plants are found in three localities that are geographically distant from each other (Japan & China, Malay Penisular, North Borneo). UPGMA cladgram based on genetic identities suggests their independent origin from different diploid populations.