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Isopaches decolorans (Limpr.) H. Buch, a rare, arctic and alpine species with remarkably disjunct distribution of the northern hemisphere, is found for the first time in Xizang (Tibet), China. In China it is a poorly known liverwort previously reported only from Sichuan and Yunnan. The colorful illustrations and detailed description of I. decolorans are provided, and SEM observation of elaters and spores is presented for the first time.