Zhao, D.-P., He, S., Tsegmed, Ts. & Mamtimin, S. 2018. Range extension of Didymodon tibeticus to Mongolia and a new synonym of Didymodon nigrescens. – Herzogia 31: 311–316.
Didymodon tibeticus (Pottiaceae) is reported from Mongolia for the first time outside of the type locality. Didymodon rigidulus var. perobtusus is proposed as new synonym of D. nigrescens.