Thanks are due to Dr Herman Stieperaere for drawing my attention to the location of Douin’s herbarium at BR and to him and his colleagues at the National Botanical Garden of Belgium for loan of the Ephemerum specimens described in this note.
Taxonomic Additions and Changes: Ephemerum serratum (Hedw.) Hampe, (Ephemerum stellatum var. denticulatum Douin, syn. nov.)