What is Trematodon hakusanensis?

Abstract

Trematodon hakusanensis H.Akiyama was described from Mt. Hakusan, central Japan in Acta Phytotaxonomica Geobotanica 35; 21 in 1984. When we studied Japanese species of Trematodon, we carefully studied the type specimen of this species. Dry plants of the type specimen looked different from other species of the same genus. However, thoroughly wet plants are very difficult to separate from those of T. ambiguus (Hedw.) Hornsch.