A TAXONOMIC REVISION OF TREMATODON ASANOI AND ITS RELATED SPECIES (DICRANACEAE, MUSCI)

抄録

  All Trematodon species described from Japan were critically studied. Trematodon semitortidens Sakurai is reduced to the synonymy of T. ambiguus (Hedw.) Hornsch. which is widely distributed in Europe, N. America and Asia. Trematodon asanoi Tuzibe which was once erroneously reduced to the synonymy of T. semitortidens Sakurai is recognized as a good species. Trematodon hakusanensis H.Akiyama is reduced to T. ambiguus (Hedw.) Hornsch., and T. brevicarpus H.Akiyama to T. asanoi Tuzibe, respectively. Examination of the type specimen of Trematodon boasii Schofield resulted in the conclusion that the species is identical to T. asanoi Tuzibe. Following these treatments, four species of Trematodon are recognized in Japan. A key to Japanese species of Trematodon is given. Descriptions, illustrations and distribution of Trematodon ambiguus (Hedw.) Hornsch. and T. asanoi Tuzibe are provided.