Abstract
The palaeotropic moss genus Radulina W.R.Buck & B.C.Tan is revised, resulting in the genus being reduced to four species and one variety. The following 14 names become synonyms of the oldest name in the genus, Radulina borbonica (Bél.) W.R.Buck: Hypnum hamatum Dozy & Molk., Sematophyllum subinstratum Besch., Hypnum trachyamphorum Müll.Hal., Sigmatella hamicuspis Müll.Hal. in Paris, nom. nud., Trichosteleum borbonicum var. brachycarpum Renauld & Cardot, Trichosteleum subtile Broth. & Watts, Trichosteleum aequoreum M.Fleisch. ex Dixon, Trichosteleum elegantissimum M.Fleisch., Trichosteleum elegantissima var. scabriseta M.Fleisch., Trichosteleum hamatum var. glabriseta M.Fleisch., Trichosteleum hamatum var. tuberculisetum M.Fleisch., Trichosteleum carolinarum Dixon, Trichosteleum neocaledonicum Thér, Trichosteleum flexuosa-hamatum Dixon. In addition, three of these taxa are lectotypified: Trichosteleum subtile Broth. & Watts, Trichosteleum aequoreum M.Fleisch. ex Dixon and Trichosteleum hamatum var. tuberculisetum M.Fleisch. The following are new combinations: Radulina borbonica var. ferriei (Cardot & Thér. in Thér.) O’Shea (= Radulina hamata var. ferriei (Cardot & Thér. in Thér.) B.C.Tan & Y.Jia), Radulina sematophylloides (Dixon) O’Shea (= Trichosteleum sematophylloides Dixon) and Trichosteleum koghiense (Thér.) O’Shea (= Trichosteleum neocaledonicum var. koghiense Thér.).