Rosulabryum billarderii (Schwägr.) J.R.Spence
Rosulabryum billarderii is the name of a species, part of the genus Rosulabryum.
This name is an alternative combination by J.R.Spence of an original description of species by Schwägr. under the rules of the International Code of Nomenclature for algae, fungi, and plants (ICN / commonly called the botany code)..