1. Plagiopus oederianus (Sw.) Crum & Anderson 寒地平珠藓 han di ping zhu xian
Mosses E. N. Amer. 1: 636. 1981. Bartramia oederiana Sw., J. Bot. (Schrader) 2: 180. 1802. Type: Europe.
Bartramia grandiflora Schwaegr., Sp. Musc. Frond., Suppl. 1(2): 48. 1816.
Plagiopus oederi (Brid.) Limpr., Laubm. Deutschl. 2: 548. 1895. Bartramia oederi Brid., Muscol. Recent. 2(3): 135. 1803.
Plants medium-sized to rather large, dark green or brownish green, in dense or somewhat loose tufts. Stems erect, 2–10 cm high, often branched, with dense rhizoids below. Leaves narrowly to somewhat broadly lanceolate, gradually acuminate with a long slender apex, erect-spreading to squarrose, more or less keeled above; margins usually double-toothed, sometimes single-toothed; costae ending below the apex or percurrent, smooth or slightly denticulate at back near apex; upper cells shortly rectangular; median leaf cells rectangular, 14–20 µm × 6–8 µm, smooth; basal cells larger. Setae 4–8 mm long; capsules suberect to inclined, spherical, furrowed when dry; opercula very low conic; peristome double; exostome teeth lanceolate, smooth or papillose, golden yellowish or orange-red; endostome segments linear-lanceolate, perforate, nearly as long as the teeth; basal membrane high; cilia single. Spores ellipsoidal, 24–26 µm × 18–20 µm, coarsely papillose.