Dicranoweisia fastigiata, a new synonym of Hymenoloma antarcticum (Seligeriaceae)

A taxonomic and nomenclatural history of Dicranoweisia fastigiata Paris is outlined. The species is taxonomically assessed and it is considered to be conspecific with Hymenoloma antarcticum (Müll.Hal.) Ochyra. Dicranum Hedw. sect. Isocarpus Mitt. is lectotypified with Dicranum antarcticum (Müll.Hal.) Mitt. and this sectional name is reduced to synonymy with Hymenoloma Dusén.