Nomenclatural history of the generic name Haplocladium (Bryophyta: Leskeaceae)

The nomenclatural history of the moss generic name Haplocladium is discussed. Originally, this name was validly published in 1879 by Karl Müller of Halle as a subsection, Hypnum subsect. Haplocladium . It gained generic status in 1897 when the same author provided a brief diagnosis of the new genus Haplocladium . Under Art. 41.4 Haplocladium is treated as a name at a new rank published without reference to the presumably intended basionym Hypnum subsect. Haplocladium . It is shown that the authorship of Haplocladium microphyllum, which was previously attributed to "(Hedw.) Broth.", should correctly be ascribed to "(Hedw.) Müll.Hal." (in Hedwigia 36: 140. Jun 1897). The confusion associated with H. gracile is clarified and the authorship of this name is correctly attributed to "(Schimp.) Müll.Hal." (in Hedwigia 36: 140. Jun 1897).