Abstract
Eighteen taxa are proposed as new synonyms in this study. Barbula calycina Schwägr. and Tortula ruraliformis (Besch.) Ingham are reported new for China. The types of Barbula pugionata Müll. Hal. and Streblotrichum gracillimum Herzog could not be located; comments on these two taxa are given. Barbula pugionata is considered as a questionable synonym of Syntrichia gemmascens (P.C. Chen) R.H. Zander. Streblotrichum gracillimum is Bellibarbula recurva (Griff.) R.H. Zander. Fruiting specimens of Didymodon giganteus (Funck) Jur., Didymodon leskeoides K. Saito and Didymodon subandreaeoides (Kindb.) R.H. Zander are reported from the Himalayas. Didymodon subandreaeoides and Bryoerythrophyllum rubrum (Geh.) P.C. Chen are reported new for Mongolia. Didymodon hastatus (Mitt.) R.H. Zander replaces Didymodon maschalogena (Renauld & Cardot) Broth. Barbula subcontorta Broth. is here viewed as Didymodon tectorum (Müll. Hal.) K. Saito: the latter is a distinct species.