Rhachitheciaceae, Robinson, 1964

Chantanaorrapint, Sahut, Sevanakun, Nilobon, Suwanmala, Orawanya, Sukkharak, Phiangphak, Printarakul, Narin & He, Si, 2021, The moss family Rhachitheciaceae (Dicranales, Bryophyta) in Thailand, Phytotaxa 520 (3), pp. 279-284 : 280

Key to the species of the Rhachitheciaceae in Thailand

1. Leaves usually less than 1 mm, chlorophyllose laminal cells papillose, costa ending just below leaf apex. Seta strongly spiraling; peristome teeth with palisade-like markings on both surfaces................................................................. Hypnodontopsis spathulata

1. Leaves usually longer than 1 mm long, chlorophyllose laminal cells smooth, costa 4/5–6/7 the leaf length. Seta somewhat straight; peristome teeth without palisade-like markings ....................................................................................... Rhachithecium perpusillum