抄録
Of the 19 Hypnum species known from Japan, the following 15 species are treated, with synonymy, description, illustration, ecology, distribution, selected diagnostic characters and differentiation from alied species: Hypnum dieckii, H. erectiusculum, H. fauriei, H. fujiyamae, H. lindbergii, H. oldhamii, H. pallescens, H. plicatulum, H. plumaeforme (including var. minus), H. pratense, H. saitoi, H. sakuraii, H. subimponens spp. ulophyllum, H. tristo-viride, and H. vaucheri.
