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Abstract
Hypopterygium obstusum is described and illustrated as a new moss species from Guizhou, southwest China. The new species is mainly characterized by its medium to large size, irregularly pinnate to bipinnate branching, absence of axial cavities, octostichous phyllotaxis, and isophyllous foliation in stipe and basal rachis, indistinct border in all leaves and amphigastria, acute to obtuse leaf apex in lateral frond leaves, and presence of gemmae. Phylogenetic analysis resolved H. obstusum sister to H. flavolimbatum based on plastid rps4, trnG, trnL–F, and nuclear internal transcribed spacer (ITS) sequences. A detailed morphological description, an illustration of the new species, and a key to all Chinese species of this genus are provided.