An investigation was conducted on bryophytes from the Hinata-gawa (river) and adjacent areas, east of Mt. Ohyama. Kanagawa, Japan, from April, 2002 to May, 2006. A total of 138 species of mosses, 55 species of liverworts, and 3 species of hornworts were recognized from approximately 580 specimens collected. Taxa of phytogeographic interest included Diphyscium kashimirense, Fissidens geppii, Cyathophorum hookerianum, Homaliadelphus targionianus, Duthiella speciosissima, and Frullania diversitexta.