Taxonomic updates and treatments of Hypnum (Hypnaceae) in Thailand and five new records for Thai moss flora

Abstract

  A recent investigation into the four species of Hypnum Hedw. s. l. hitherto reported for Thailand confirms only two species that are consequently placed in Calohypnum Sakurai: Hypnum darjeelingense Ando [＝C. sikkimense (Renauld & Cardot) Jan Kučera & Ignatov] and H. plumiforme Wilson [＝C. plumiforme (Wilson) Jan Kučera & Ignatov]. The previous records of H. sakuraii (Sakurai) Ando and H. submolluscum Besch. in Thailand were based on misidentifications. The genus Hypnum is excluded from Thailand and Calohypnum is recognized. Based on the latest collections we made, five mosses: Claopodium aciculum (Broth.) Broth., Dicranoloma reflexum (Müll.Hal.) Renauld, Entodon scariosus Renauld & Cardot, Taxiphyllum giraldii (Müll.Hal.) M.Fleisch., and Vesicularia flaccida (Sull. & Lesq.) Z.Iwats. are reported new to Thai moss flora. The descriptions, illustrations, and key to species of Calohypnum in Thailand as well as diagnostic characters of the new moss records are provided.