An Appalachian endemic liverwort, Nardia lescurii(Aust.) Underw. (Jungermanniaceae), is for the first time reported from Japan; Mts. Yatsugatake in central Honshu and Mts. Zao in northern Honshu. Based on the Japanese materials, a description, figure and note of this species are given.

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A key and helpful figures for determination for the Japanese Calypogeia, which includes 15 species and one subspecies, are provided.

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Propagules (caducous branchlets type) were found on Bryum paradoxum. They are found in the upper leaf axils, are small and branch-like, and are of various sizes from 0.5 mm to 1 cm in length. The basal part of the propagules are composed of several cells, and abscission organs are not differentiated.

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