5. Calliergon stramineum (Dick. ex Brid.) Kindb. 草黄湿原藓 cao huang shi yuan xian
Canad. Rec. Sci. 6(2): 72. 1894. Straminergon stramineus (Brid.) Hedenäs, J. Bryol. 17: 463. 1993. Acrocladium stramineum (Brid.) P. W. Richards & E. C. Wallace, Trans. Brit. Bryol. Soc. 1(4): 25. 1950. Amblystegium stramineum (Brid.) De Not., Atti Reale Univ. Genova 1: 137. 1869. Hypnum stramineum Dicks. ex Brid., Muscol. Recent. 2(2): 172. 1801. Type: England.
Plants medium-sized, yellowish green, glossy, in loose mats. Stems erect to ascending, to 10–20 cm long, simple or rarely branched. Stem leaves closely imbricate, 2.0–2.5 mm × 0.7–0.9 mm, elongate-lingulate, slightly plicate at margins, obtuse, cucullate at apex; margins entire, decurrent at leaf base; costae single, reaching 3/4–5/6 the leaf length, often with reddish brown rhizoids at back; median leaf cells linear, 8–15 times as long as wide; upper leaf cells shortly rhomboidal or shortly quadrate; basal cells shorter than median cells; alar cells hyaline, thin-walled, forming a sharply delimited group along margins. Sporophytes not seen.