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Gemmabryum J.R.Spence & H.P.Ramsay is considered to be congeneric with two monotypic South American moss genera, Neobryum R.S.Williams and Osculatia De Not., of which the latter has priority. It is the earliest available generic name for one of the largest segregates of the broadly conceived genus Bryum Hedw. which consists of some 44 species disposed in three sections that have a worldwide distribution. Traditionally, they were all placed in Bryum or Brachymenium Schwägr. and the relevant transfers to Osculatia are effected in the present account.
