A new Orthotrichum species, O. karoo, is described. The moss has a gametophyte similar to that of O. diaphanum, from which it mainly differs in its peristome lacking exostome teeth. It is known from three localities in western South Africa, and from one more in southern Namibia. In all these localities it was found growing on shrubs and trees, rarely on rocks, in succulent karoo and related types of vegetation.
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