5. Hygrohypnum molle (Hedw.) Loeske 圆叶水灰藓 yuan ye shui hui xian
Moosfl. Harz. 320. 1903. Amblystegium molle (Hedw.) Lindb., Musci Scand. 33. 1879. Limnobium molle (Hedw.) Schimp. in B.S.G., Bryol. Eur. 6: 69. 1853. Hypnum molle Hedw., Sp. Musc. Frond. 273. 1801. Type: Scotland.
Hygrohypnum dilatatum (Wilson) Loeske, Moosfl. Harz. 320. 1903. Platyhypnum dilatatum (Wilsson) Loeske, Hedwigia 50: 243. 1911. Hypnum dilatatum Wilson in Schimp., Syn. Musc. Eur. (ed. 2): 776. 1876.
Plants small to rather large, green or yellowish green, glossy. Stems prostrate, irregularly branched; branches ascending, elongate, to 2–3 cm long. Stem leaves erect or spreading above, 0.8–2.0 mm × ca. 0.9 mm, elliptical to subcordate, obtuse at apex; margins entire or serrulate near apex; costae short, double, vanishing at 1/4–3/4 the leaf length; median leaf cells linear, 45–60 mm × 3–4 mm; apical and submarginal cells shorter; basal cells thick-walled, porose; alar cells subquadrate to shortly rectangular, forming an indistinct group. Autoicous. Setae 12–15 mm long, reddish brown; capsules reddish brown, cylindrical, curved; endostome segments carinate; cilia 1–2, shorter than or as long as the segments, nodulose. Spores 11–13 mm in diameter, minutely papillose.