A note on Nardia japonica Steph. (Gymnomitriaceae)
An attempt to clarify the morphological concept of Nardia japonica is provided. This species is characterized by coarsely granulate oil bodies which contradicts to homogenous oil bodies ascribed to this species by several authors. The plants bearing homogenous oil bodies belong to the new, previously undescribed, Nardia pacifica Bakalin sp. nov. The report of N. lescurii from Japan seems to be based on misidentification of N. japonica, while the former is the Appalachian endemic species.